Ranatensin is a undecapeptide and a Bombesin Receptor angonist, can be isolated from amphibian skin, such as the frog, Rana pipiens. Ranatensin could maintain the dynamic balance of animal blood pressure, without cross-tachyphylaxis with Angiotensin amide, Bradykinin , or Norepinephrine .

Histatin-8 is a part of the Histatin-3 central sequence and is known as hemagglutination-inhibiting peptide. Histatin-8 is a potent anti-fungal peptide. Histatin-8 shows antimicrobial activity against yeast strains. Histatin-8 can be used for oral thrush research.

Guanosine monophosphate also known as guanylic acid or 5'-GMP belongs to the class of organic compounds known as purine ribonucleoside monophosphates. In particular L-Glutamic acid and guanosine monophosphate can be biosynthesized from xanthylic acid and L-glutamine; which is catalyzed by the enzyme GMP synthase.