Figure 5
From: Systematic evaluation of sericin protein as a substitute for fetal bovine serum in cell culture

Population doubling time of three types of cells in sericin-substituted and control medium.
Data are shown as the Mean ± SD values for the three cell lines (n = 4). Control: control medium (10% FBS); Sericin: sericin-substituted medium (FBS-free, 30 μg/ml sericin protein). Asterisks indicate significant difference (P < 0.05) by two-tailed paired Student t-test.