homocysteine molecular structure 3d, flat model, alpha-amino acid, structural chemical formula view from a microscope

homocysteine alphaamino acid homologue molecule molecular structure chemical formula model c4h9no2s atom chemistry risk scientific drawing structural element amino atomic illustration sulfur carbon cardiovascular oxygen research science serum compound icon sign blood bond depression marker plasma stroke test alzheimer ball dementia hydrogen stick technology flat alpha-amino view from microscope microscope