A tryptophan-rich preparation for improving emotional and cognitive functions.

Peptidoglycan immunoadjuvant originally isolated from bacterial cell wall fragments; also acts as pyrogen and may cause arthritis; stimulates both humoral and cellular immunity.

Ala-Ala dipeptide is added to this tripeptide by MurF synthetase to make the peptidoglycan pentapeptide; often called muramyl tripeptide but that term is ambiguous, confused with other tripeptides of muramic acid; the phosphatidylethanolamine conjugate is sometimes used.

A dibenzo-alpha-pyrone from Streptomyces murayamaensis.

From Streptomyces flavidovirens.

From Streptomyces flavidovirens.

From Streptomyces flavidovirens.

From Streptomyces flavidovirens.