The epidermal growth factor receptor is the cell-surface receptor for members of the epidermal growth factor family of extracellular protein ligands.

ortho-Hydroxyphenylacetic acid (2-hydroxybenzeneacetic acid) can be found in a number of food items such as natal plum lemon verbena half-highbush blueberry and parsley which makes ortho-hydroxyphenylacetic acid a potential biomarker for the consumption of these food products. ortho-Hydroxyphenylacetic acid can be found primarily in blood feces and urine.

Phyllanthusiin C is a natural product of Terminalia, Combretaceae. Phyllanthusiin C can be used as a reference standard.