Uberon definition : A tube-like opening in the epidermis where the hair shaft develops and into which
the sebaceous glands open[GO].;
Uberon Homology note : The earliest reliable record of hair is found in a fossil of the Paleocene period,
in which the structure of hair cuticles is preserved. Its appearance suggests that
the complicated structure of the hair follicle, closely similar to that of present-day
mammals, had already appeared at this time.[well established][VHOG];