Mammary Gland during Pregnancy (IMAGE) Walter and Eliza Hall Institute Caption Microscopy reveals the tree-like arrangement of the milk-producing cells in the mammary gland during pregnancy. Credit Dr Anne Rios, Walter and Eliza Hall Institute 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.