[[Image:Active Mammary Gland.jpg|left|thumb|250px|<small><center> The Active Mammary Gland (Courtesy of Tanya Hopcroft (RVC))</center></small>]] | [[Image:Active Mammary Gland.jpg|left|thumb|250px|<small><center> The Active Mammary Gland (Courtesy of Tanya Hopcroft (RVC))</center></small>]] |