The distance and the composition between the Shine-Dalgarno(SD)sequence and the start codon have, profound effect on the expression of prochymosin gene causing a 15fold difference.

• Shine-Dalgarno序列与起始密码子之间的距离与组成对凝乳酸原基因表达有明显的影响,可导致其表达水平有15倍之差。