Fig. 3. Viable cell numbers (1 × 10⁷ CFU mL⁻¹) of Lactobacillus acidophilus JCM 1132 incubated for 48 h in different nitrogen source media. FN = MRS, HN = MRS without half nitrogen source, HN + Pep = HN with soybean oligopeptide, HN + dPep = HN with digested soybean oligopeptide, HN + Pro = HN with soybean protein, HN + dPro = HN with digested soybean protein. ND = not detection. Values are presented as mean ± SD, n = 3. Different capital letters indicate values in the same group at different time points with significant difference (p < 0.05). Different lowercase letters indicate values in six groups at each time point with significant difference (p < 0.05).