Figure 1From: M cell targeting by a Claudin 4 targeting peptide can enhance mucosal IgA responsesImmunization with chemical conjugation of CPE to HA antigen. Basic protocol using HA antigen chemically conjugated to the CPE targeting peptide, showing induction of both systemic serum and mucosal antibody responses. A, Immunization time line. B, ELISA results, showing fluorescence units of anti-HA response at specified dilutions.Back to article page