Reduction of IgG in nonhuman primates by a peptide antagonist of the neonatal Fc receptor FcRn. Mezo AR, McDonnell KA, Hehir CAT, et al. Reduction of IgG in nonhuman primates by a peptide antagonist of the neonatal Fc receptor FcRn. Proc Natl Acad Sci U S A. 2008;105(7):2337-42. doi:10.1073/pnas.0708960105 Read more