Nerves of the Mammary Gland (IMAGE) Johns Hopkins Medicine Caption Immature mammary glands from a female (left) and male (right) mouse after the nerve cells (yellow) have retracted from the male tissue. Mammary gland cells labeled in blue. Credit Yin Liu Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.