A 5' distal palindrome within the mouse mammary tumor virus-long terminal repeat recruits a mammary gland-specific complex and is required for a synergistic response to progesterone plus prolactin.
Morabito JE, Trott JF, Korz DM, Fairfield HE, Buck SH, Hovey RC. A 5' distal palindrome within the mouse mammary tumor virus-long terminal repeat recruits a mammary gland-specific complex and is required for a synergistic response to progesterone plus prolactin. J Mol Endocrinol. 2008 Aug; 41(2):75-90.