sentences:  The tubules are wrapped in myoepithelial cells, which are more developed than in their eccrine gland counterparts.In hoofed animals and marsupials, apocrine glands act as the main thermoregulator, secreting watery sweat.For most mammals, however, apocrine sweat glands secrete an oily (and eventually smelly) compound that acts as a pheromone, territorial marker, and warning signal.