Davis J L, Pico R M, Cherkin A
Pharmacol Biochem Behav. 1982 Nov;17(5):893-6. doi: 10.1016/0091-3057(82)90467-1.
Two-day-old chicks were injected either intraventricularly or intraperitoneally with saline or a L-prolyl-L-leucyl-glycinamide solution. This C-terminal tripeptide of oxytocin produced retrograde enhancement when injected centrally but not peripherally. Possible memory mechanisms are discussed in light of this peptide's relationship to oxytocin, MSH, and dopaminergic systems.
