There are disclosed active fragments of vasoactive peptides and methods of preparation. The active fragments comprise the following amino acid sequences: (a) X-MET-ALA-VAL-X.sub.1 (b) X-MET-ALA-VAL-LYS-X.sub.1 (c) X-MET-ALA-VAL-LYS-LYS-TYR-LEU-ASN-SER-Y-LEU-Z-X.sub.1 wherein X is hydrogen, glutamyl, or pyroglutamyl, X.sub.1 is OH or NH.sub.2 ; Y is ILE or VAL; and Z is ASN or THR.
披露了一种血管活性肽的活性片段和制备方法。这些活性片段包括以下
氨基酸序列:(a) X-MET-A
LA-VAL-X.sub.1 (b) X-MET-A
LA-VAL-LYS-X.sub.1 (c) X-MET-A
LA-VAL-LYS-LYS-TYR-LEU-ASN-
SER-Y-LEU-Z-X.sub.1,其中X为氢、谷
氨酰或
吡環谷
氨酰,X.sub.1为OH或NH.sub.2;Y为ILE或VAL;Z为ASN或THR。