Negri ea 1992
Negri L., Erspamer G.F., Severini C., Potenza R.L., Melchiorri P., Erspamer V. Dermorphin-related peptides from the skin of Phyllomedusa bicolor and their amidated analogs activate two mu opioid receptor subtypes that modulate antinociception and catalepsy in the rat. //Proc. Natl. Acad. Sci. USA. 1992. Vol. 1., 89 (15). P. 7203-7207.