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Changes in the D-antigen contents of the sIPV after different −20°C treatments.
(a) 3 types of lot 20151019.(b) 3 types of lot 20151018.(c) 3 types of lot 20151222.(d) 3 types of all 3 lots totaling 45 samples. – – : release specification.*:0.01 < p < .05; **:p < .01.
