'D'- form of amino acid is derived from?
Produced in liver
Break down from muscle
From external source
Synthesis in muscle
The amino acids which we can be synthesized in our body are always in 'L'-form. So, the source of 'D' amino acids is always exogenous either from diet or from intestinal bacterias. In body all L- amino acids are present and none of D-amino acids except D-serine and D-aspaate in Brain
Basics of amino acids