amino acids special cases. selenocysteine, cysteine, proline, glycine. structural chemical formula and line model of molecule.

abstract acid acids amino atom atomic biochemistry biology bond cases chain chart chemical chemistry compound cysteine design draw emblem formula glycine graphic group health icon illustration infographic line medicine model molecular molecule neurotransmitter outline pharmacy picture plan poster proline science selenocysteine set sign silhouette simple skeletal sketch special structural structure supplement symbol vector