抗原变异 antigenic variation ; antigenic evolution ; antigen variation ; antigenic variance 癌抗原 SCCAg ; CA ; Cancer antigen ; squamous cell carcinoma antigen .
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Since it occurred only rarely, it was unlikely to be an antigen caused by genetic variation in human blood.
由于这种抗原很少出现，因此它不可能是由于人类血液中遗传变异形成的抗原。
Methods: According to the principle and methods of the WHO stipulation, the influenza epidemic strains, antigen, gene variation, serum antibody and virus multi-pathogen were monitored.
方法：按who规定的原理和方法进行：对流感流行株、抗原和基因变异以及血清抗体和病毒多病原实行监测。
Objective Study the relationship between type A influenza virus genetic variation with survival selective pressure, help for the finding of possible vaccine conserved antigen target.
目的研究甲型流感病毒基因变异与生存选择压力的关系，指导保守疫苗靶位点的寻找。
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