PD4抗原主要表达于靶细胞的膜上，不耐热，为分子量40kD的蛋白性抗原。
The PD4 antigen was expressed on the membrane of target cells and it was a heat-sensitive protein of40KD molecular weight.
它具有较小的分子质量，良好的耐热性和较小的抗原性，且具有广泛的抗菌活性。
They have small molecular mass, good thermostability and antigenicity. They have broad spectrum-antibacterial activity.
它具有较小的分子质量，良好的耐热性和较小的抗原性，且具有广泛的抗菌活性。
They have small molecular mass, good thermostability and antigenicity. They have broad spectrum-antibacterial activity.
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