INSR (5D9 antibody, anti-INSR-B and anti-phosphoINSR Y1162/Y1163) protein expression in African-American and Caucasian breast cancer cell lines [CRL-2329 (ER+), CRL-2335 (ER−), Hs578T (ER−) and MCF-7(ER+)] assessed by western blot analysis for comparison purposes (1A). Lower panel shows bar graph of INSR, INSR-B and phosphorylated INSR data normalized to β-actin and presented as the mean ± SE of all samples per group. Asterisks and Carets indicate values statistically different (*p<0.05, **p<0.01, ^p<0.03).