By day 10, the white pulp proliferated markedly, the number of pyroninophilic cells maxmized during the whole immunization, particularly in the PELS, pyroninophilic cells were nearly equal to those in the PALS.

• 免疫后第十天，白髓增殖显著，嗜派若宁细胞增多到整个免疫过程中的最高峰，尤其是PELS内嗜派若宁细胞数量几乎与PALS持平。