We also observed the selective inhibition of the MTT-based viability of MDA-MB-231 cancer cells by recombinant Hsp90ab1, Eno1, and Ubc proteins, compared to that of the three lines of human epithelial cells of breast origin (KTB6, KTB22, and KTB34) (Figure 7G). Here, HSP90AB1 is linked to cancer.