Akin to the CD4+ CTL described in IgG4-RD patients (Della-Torre et al., 2018), the CD4+ CTL found in LatY136F mice expressed the SLAMF7 signaling receptor and its SH2D1A cytosolic adaptor (Data S3). The gene discussed is SLAMF7; the disease is immunoglobulin G4-related sclerosing disease.