Exocrine gland-secreting peptides (ESPs) are a protein family involved in the pheromonal communication of rodents. ESP1 is a lacrimal peptide synthesized by the extraorbital glands of males of specific mouse strains that modulates the sexual behavior in females. Reportedly. BALB/c males. https://www.bekindtopets.com/top-save-Meaty-Treats-Gourmet-Cuts-25-oz-save-extra/