Methionine replacements in biologically active peptides

Methionine replacements in biologically active peptides Synthesis and binding affinities of analogs of cholecystokinin-(30-33) as probes for central nervous system cholecystokinin receptors Pseudopeptide analogs of substance P and leucine enkephalinamide containing the .psi.(methyleneoxy) modification: synthesis and biological activity Structure–activity relationship study of tachykinin peptides for the development of novel neurokinin-3 receptor selective agonists Conformational Comparisons of a Series of Tachykinin Peptide Analogs Cyclic enkephalin analog containing .alpha.-amino-.beta.-mercapto-.beta.,.beta.-pentamethylenepropionic acid at position 2 or 5 Substituted hippurates and hippurate analogs as substrates and inhibitors of peptidylglycine α-hydroxylating monooxygenase (PHM) Tetrahydro anthranilic acid as a surrogate for anthranilic acid: Application to the discovery of potent niacin receptor agonists Synthesis and biological evaluation of analogs of Pro-Leu-Gly-NH2 modified at the leucyl residue Structure, determination, pharmacological evaluation, and structure-activity studies of a new cyclic peptide substance P antagonist containing the new amino acid 3-prenyl-.beta.-hydroxytyrosine isolated from Aspergillus flavipes