(biochemistry) Any of a large group of macrocyclic peptides whose structure resembles a knotted lasso

(biochemistry) The inactive polypeptide excised from proinsulin during its conversion to insulin, containing 31 amino acid residues and secreted in equimolar amounts to insulin from beta cells.

(biochemistry) A synthetic organic polymer similar to DNA or RNA; the sugar backbone of nucleic acids is replaced by N-(2-aminoethyl)-glycine linked through peptide bonds - considered a possible precursor to RNA

(biochemistry) A strong vasodilatory, peptide hormone, secreted by the cardiac muscle cells.

plural of peptide nucleic acid

(medicine, endocrinology) A peptide hormone that is vasoactive in the intestine.