Big Endothelin-1 (22-38), human is derived from human, is the 22-38 fragment of Big Endothelin-1 (ET-1) (1-38). Big ET-1 (1-38) is a propeptide of ET-1, which has potent and long-lasting vasoconstrictor effects, equips a specific enzymatic cleavage of the 38 amino acid chain to form ET-1 (1-21) and the C-terminal fragment Big ET-1 (22-38).

The barks of Magnolia officinalis.

Uty HY Peptide (246-254) is a male-specific graft antigen H-Y derived from the H-Y epitopes of the widely transcribed tetrapeptide duplication gene H-YDB on the Y chromosome (Uty) protein。