Eligibility Details:  
        -  Cardiovascular Disease Eligibility Criteria
        INCLUSION CRITERIA:
          -  Females and males 18 years of age or older
          -  Diagnosis of clinical CAD (including abnormal EKG with a prior infarction pattern,
             abnormal echo consistent with a wall motion abnormality or a referral note from
             cardiologist with diagnosis of CAD)
          -  CAD that is currently stable (defined by no change in medications for blood pressure,
             angina or diuretic therapy or in no new CV symptoms over the past month in a patient
             who has had a primary cardiac event or an abnormal EKG with confirmed wall motion
             abnormality)
          -  CAD which may be associated with chronic stable angina (defined by a clinical syndrome
             characterized by discomfort in the chest, jaw, shoulder, back, or arm by a physician).
        EXCLUSION CRITERIA:
          -  For imaging studies, pregnant women.
          -  For imaging studies, lactating women
          -  For optional adipose biopsy, any subject with known bleeding disorder, current fever
             or on anti-coagulation.
          -  For optional MRI, inability to participate due to metal within body, claustrophobia,
             or anything else that prohibits undergoing a MRI scan
          -  Any solid organ or liquid tumor within the past five years, with the exception of
             nonmelanomatous skin cancer,
          -  Active infectious diseases within 3 months requiring antibiotics, collagen vascular
             diseases such as RA, psoriasis and mixed connective tissue diseases and
             immune-mediated lung diseases (e.g. IPF, BOOP)
          -  A BMI >40 kg/m(2) due to PET MRI restrictions
          -  Subjects with severe renal excretory dysfunction, estimated glomerular filtration rate
             < 30 mL/min/1.73m(2) body surface area according to the Modification of Diet in Renal
             Disease criteria, will not receive the cardiac CT angiography, or gadolinium contrast
             agent during the PET/MRI.
          -  Subjects with second -or third-degree AV block or sinus node dysfunction will not
             receive the 13N-ammonia PET/CT imaging unless these patients have a functioning
             artificial pacemaker.
          -  Subjects with any signs or symptoms of acute coronary syndrome, including vasoreactive
             hypertension with blood pressure exceeding 180/100, any concerning ST segment changes
             on ECG, or acute chest pain, will not receive the 13N-ammonia PET/CT imaging.
        Diabetes Mellitus Eligibility Criteria
        INCLUSION CRITERIA:
          -  Females and males 18 years of age or older
          -  Diagnosis of type 2 diabetes mellitus (DM), currently stable as defined by no change
             in antidiabetic medications over the past month and fasting glucose <200
        EXCLUSION CRITERIA:
          -  For imaging studies, pregnant women
          -  For imaging studies, lactating women
          -  For optional adipose biopsy, any subject with known bleeding disorder, current fever
             or on anti-coagulation.
          -  For optional MRI, inability to participate due to metal within body, claustrophobia,
             or anything else that prohibits undergoing a MRI scan
          -  Any solid organ or liquid tumor within the past five years, with the exception of
             nonmelanomatous skin cancer,
          -  Active infectious diseases within 3 months requiring antibiotics, collagen vascular
             diseases such as RA, psoriasis and mixed connective tissue diseases and
             immune-mediated lung diseases (e.g. IPF, BOOP)
          -  A BMI >40 kg/m(2) due to PET MRI restrictions
          -  Subjects with severe renal excretory dysfunction, estimated glomerular filtration rate
             < 30 mL/min/1.73m(2) body surface area according to the Modification of Diet in Renal
             Disease criteria, will not receive the cardiac CT angiography, or gadolinium contrast
             agent during the PET/MRI.
          -  Subjects with second -or third-degree AV block or sinus node dysfunction will not
             receive the 13N-ammonia PET/CT imaging unless these patients have a functioning
             artificial pacemaker.
          -  Subjects with any signs or symptoms of acute coronary syndrome, including vasoreactive
             hypertension with blood pressure exceeding 180/100, any concerning ST segment changes
             on ECG, or acute chest pain, will not receive the 13N-ammonia PET/CT imaging.
        Healthy Volunteers:
        INCLUSION CRITERIA:
        -Females and males 18 years of age or older without any clinical diagnosis of a chronic
        health condition that is knownto accelerate vascular disease beyond traditional risk
        factors including lung disease or active infection
        EXCLUSION CRITERIA:
          -  For imaging studies, pregnant women
          -  For imaging studies, lactating women
          -  For optional MRI, inability to participate due to in optional MRI metal within body,
             claustrophobia, or anything else that prohibits undergoing a MRI scan
          -  Any solid organ or liquid tumor within the past five years, with the exception of non
             melanomatous skin cancer,
          -  Active infectious diseases within 3 months requiring antibiotics, collagen vascular
             diseases such as RA, psoriasis and mixed connective tissue diseases and
             immune-mediated lung diseases (e.g. IPF, BOOP)
          -  Clinical diagnosis of diabetes or cardiovascular disease
          -  Fasting glucose >125,
          -  LDL>200,
          -  LFT s 3 times normal limit,
          -  eGFR<60,
          -  Subjects with severe renal excretory dysfunction will not receive the cardiac CT
             angiography, or gadolinium contrast agent during the PET/MRI.
          -  A BMI >40 kg/m(2) due to PET MRI restrictions.
          -  Subjects with second -or third-degree AV block or sinus node dysfunction will not
             receive the 13N-ammonia PET/CT imaging unless these patients have a functioning
             artificial pacemaker.
          -  Subjects with any signs or symptoms of acute coronary syndrome, including vasoreactive
             hypertension with blood pressure exceeding 180/100, any concerning ST segment changes
             on ECG, or acute chest pain, will not receive the 13N-ammonia PET/CT imaging.