Viability of MDA-MB-231 and MCF-7 cells after CD24 cross-linking. A) MCF-7 cross-linked with anti-rabbit polyclonal IgG in a dose dependent manner for 72 h. B) MDA-MB-231 cells were cross-linked with 500 ng/ml anti-rabbit polyclonal IgG or anti-human CD24 rabbit polyclonal antibody for 72 h. C). MCF-7 cells were cross-linked with 500 ng/ml anti-rabbit polyclonal IgG antibody or anti-human CD24 rabbit polyclonal antibody in a time dependent manner for 120 h. A-B) Relative cell survival rate is shown as percent survival versus control cells after cross-linking with anti-rabbit polyclonal IgG. C) MCF-7 cell survival is shown versus control cell survival when CD24 was cross-linked with anti-rabbit polyclonal IgG. Data represent means of at least three independent experiments and standard errors of the means. *, p value of less than 0.05 **, p value of less than 0.01.