Aliphatic Amino Acids Valine (VAL) (a - amino isovalerate) Leucine (LEU) (a - amino isocaproate) NH3 + C COO￾H CH CH3 CH3 NH3 + C COO￾H CH CH3 CH3 CH2Aliphatic Amino Acids Valine (VAL) (a - amino isovalerate) Leucine (LEU) (a - amino isocaproate) NH3 + C COO￾H CH CH3 CH3 NH3 + C COO￾H CH CH3 CH3 CH2