Figure 1

INS mRNA expression relative to 18S mRNA expression in the mammary gland. INS mRNA expression (mean ± standard error of the mean × 10^-4) compared with18S expression in the mammary gland across the four phases of lactation. After birth, INS remained low until after 100 days of lactation.a significantly higher than b (P < 0.05). INS, insulin gene.