Figure 3. Effect of growth substrates on protease production by Chryseobacterium sp. kr6 at 30ºC and initial pH 7.0 after 24 h (white bars), 48 h (dashed bars) and 72 h (black bars) cultivation. Bars are the means ± s.e.m. of three independent experiments. FKB, feather keratin broth; FMB, feather meal broth; Glc, Sac, Lac, T80, TX100 indicate the FKB contained 10 g l^-1 of glucose, sucrose, lactose, Tween 80 or Triton X-100, respectively.