comparison of the 5 ' flanking sequences of these two alpha-lactalbumin genes with those of five casein genes has revealed the presence of a highly conserved region [ consensus sequence : rgaagraaa ( n ) tggacagaaatcaa ( cg ) tttcta ] , extending from position -140 to -110 in all seven sequences examined , suggesting a possible regulatory role in the hormonal control or tissue-specific expression of milk protein genes in the mammary gland .
C0007332
casein
C0026138
milk protein