DETAILED DESCRIPTION What is claimed is: 1.
A novel peptide of the formula: ##STR15## wherein for A the L- or D- N-acetyl or N-pyroGlu imino acid is a member selected from the group consisting of N-acetyl-Pro, N-acetyl-Hyp, N-pyroGlu-Pro, and N-pyroGlu-Hyp; for B the L- or D-aromatic amino acid is a member selected from the group consisting of Phe, Trp, Tyr, and His, and the L- or D- aliphatic amino acid is a member selected from the group consisting of Ala, Leu, Ile, and Val; for C the L- or D- aromatic amino acid is a member selected from the group consisting of Phe, Trp, Tyr, and His, and the L- or D- aliphatic amino acid is a member selected from the group consisting of Ala, Leu, Ile, and Val; for E the aromatic amino acid is a member selected from the group consisting of Phe, Trp, Tyr, and His; for F the amino acid with a basic side chain is a member selected from the group consisting of Lys, Arg, and Orn; and for G the imino acid is a member selected from the group consisting of Pro and Hyp, and the aliphatic amino acid is a member selected from the group consisting of Ala, Leu, Ile, and Val.
2.
A compound according to claim 1 wherein A is pyroGlu; B is His, C is Trp; D is Ser; E is Tyr; F is Arg; G is Pro; X is GlyNH.
sub.
2, Y is isopropylmethyl; and n is 2.
3.
A compound according to claim 1 wherein A is pyroGlu; B is His; C is Trp; D is Ser; E is Tyr; F is Arg; G is Pro; X is aminoethyl; Y is isopropylmethyl; and n is 2.
4.
A compound according to claim 1 wherein A is pyroGlu; B is D-Phe; C is Trp; D is Ser; E is Tyr; F is Arg; G is Pro; X is GlyNH.
sub.
2 ; Y is isopropylmethyl; and n is 2.
5.
A compound according to claim 1 wherein A is N-acetyl-Pro; B is D-Phe; C is D-Trp; D is Ser; E is Tyr; F is Arg; G is Pro; X is GlyNH.
sub.
2 ; Y is isopropylmethyl; and n is 2.
6.
A novel peptide of the formula: ##STR16## wherein: A is L- or D- pyroGlu; L- or D-N-acetyl- or N-pyroGlu-Pro; acetyl D-Phe; or C.
sub.
3-7 cycloalkyl acyl; B is His; Gly; L- or D-: Phe, Tyr, Ala, Leu, Ile or Val; or is absent; C is L- or D-: Phe, Tyr, Ala, Leu, Ile, or Val; D is Ser; Thr; or Ala; E is Phe; or Tyr; F is Lys; or Arg; G is Pro; Ala; Leu; Ile; or Val; X is GlyNH
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Molecular Biology 
