Endomorphin 1 and endomorphin 2 suppress in vitro antibody formation at ultra-low concentrations: anti-peptide antibodies but not opioid antagonists block the activity
Antón, Benito; Leff, Phillipe; Calva, Juan C.; Acevedo, Rodolfo; Salazar, Alberto; Matus, Maura; Pavón, Lenin; Martínez, Martín; Meissler, Joseph J.; Adler, Martín W.; Gaughan, John P.; Eisenstein, Toby K. (2008)