amino acids. tryptophan, tyrosine, phenylalanine, leucine, alanine, isoleucine, valine, methionine. structural chemical formula

abstract acid alanine amino atom atomic biochemistry biology bond chain chart chemical chemistry compound design draw emblem formula graphic group health icon illustration infographic isoleucine leucine line methionine model molecular molecule neurotransmitter outline pharmacy phenylalanine picture poster science set sign silhouette simple skeletal sketch structure symbol tryptophan tyrosine valine vector