addition of 3,5,3'-triiodo-l-thyronine to cultures of mammary gland explants in serumfree medium containing insulin , hydrocortisone and prolactin results in a 3 to 5-fold increase in the activity of the milk-protein alpha-lactalbumin over that seen in the presence of the latter three hormones alone .
C0929301
mammary gland
C0002287
alpha-lactalbumin