File Name : figure s1.tif Caption : flow cytometry analysis showing average gfp intensity of recipient huvecs co-cultured with 1205lu-gfp for 7 days in 1:1 ratio with different initial seeding density (see fig.1). above, *, p < 0.05, **, p < 0.01, ***, p < 0.001, between conditions connected with horizontal bars. error bars represent standard error of mean (s.e.m).