3.9. Comparison of The highest MCA obtained was 685.7 SU/ml (without concentration of the broth), or 12,000 SU/g (with concentration of the broth). As shown in Table 5, the fact that the MCA and MCA/PA ratio of the crude enzyme obtained in this study are comparable with those of Pfizer microbial rennin and Mucor rennin has made this product a good choice for further studies and industrial exploitations.