This drawing depicts some of the key structures involved in the biological basis of heredity. After studying the image, identify the letter that labels a gene. 
Definitions:
Hepatoma
A malignant tumor of the liver, also known as hepatocellular carcinoma, which is common in individuals with chronic liver diseases.
Nephritis
Inflammation of the kidneys, which can alter their function and is classified by the location such as glomerulonephritis or interstitial nephritis.
Nephroma
A rare, typically benign tumor of the kidney tissue, which may or may not present symptoms.
Proctologist
A medical specialist focusing on the diagnosis and treatment of disorders related to the rectum, anus, and colon.
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