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. Author manuscript; available in PMC: 2010 Feb 24.
Published in final edited form as: Vet Immunol Immunopathol. 2008 Nov 1;128(1-3):147–170. doi: 10.1016/j.vetimm.2008.10.321

Fig. 4.

Fig. 4

Class switch recombination to IgG occurs during phase 2 of gestation and favors expression of IgG1 throughout fetal life except in the IPP and MLN in late gestation when IgG3 is preferentially expressed in theses organs. IgG3 expression is temporally linked to the time when the IPP is believed to function as a primary lymphoid organ (Butler and Wertz, 2006).