Figure 3: CMC agar for the detection of cellulase activity of the cloned celB and celC. A: negative control supernatant of E. coli with an empty vector. B: the supernatant of E. coli with celB gene. C: the supernatant of E. coli with celC gene. The detected yellow halo against the red background in B and C indicate the cellulase activity of the cloned gene products.