CD19 and type 1 diabetes mellitus: 24. While we did not use the CD10 marker, previous findings have reported that CD10 is homogeneously expressed at high levels in CD19+CD27−CD24hiCD38hi cells 42. One potential explanation for the lack of reproducibility of this finding in our population is a different age distribution of T1D patients and healthy controls (all adults) in Habib et al. 24 which, given the strong age-dependent effect in the frequency of CD19+CD27−CD24hiCD38hi cells, could significantly affect the observed frequencies of this immune subset.