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The copy number of endoglucanase was identified by Droplet Digital PCR and explore the relationship between copy number and protein expression.The engineered Saccharomyces cerevisiae of endoglucanase with copy numbers of 1, 3, 4, 7, 9, 11, 15, 16, 19, 21, 22 and 23 were obtained by rDNA integration, respectively. The results showed that when the copy number was 15, the enzyme activity was the highest, namely 351 U/mL. The engineered strain of Saccharomyces cerevisiae for endoglucanase was successfully constructed, which can provide ref