Pipecolic Acids2-Aminoadipic Acid: A metabolite in the principal biochemical pathway of lysine. It antagonizes neuroexcitatory activity modulated by the glutamate receptor, N-METHYL-D-ASPARTATE; (NMDA).Saccharopine Dehydrogenases: Amine oxidoreductases that use either NAD+ (EC 126.96.36.199) or NADP+ (EC 188.8.131.52) as an acceptor to form L-LYSINE or NAD+ (EC 184.108.40.206) or NADP+ (EC 220.127.116.11) as an acceptor to form L-GLUTAMATE. Deficiency of this enzyme causes HYPERLYSINEMIAS.Rhodotorula: A red yeast-like mitosporic fungal genus generally regarded as nonpathogenic. It is cultured from numerous sources in human patients.Mitosporic Fungi: A large and heterogenous group of fungi whose common characteristic is the absence of a sexual state. Many of the pathogenic fungi in humans belong to this group.Penicillium chrysogenum: A mitosporic fungal species used in the production of penicillin.Picolinic AcidsLysine: An essential amino acid. It is often added to animal feed.Oxidoreductases Acting on CH-NH Group Donors: Enzymes catalyzing the dehydrogenation of secondary amines, introducing a C=N double bond as the primary reaction. In some cases this is later hydrolyzed.Proline: A non-essential amino acid that is synthesized from GLUTAMIC ACID. It is an essential component of COLLAGEN and is important for proper functioning of joints and tendons.