IFNG and congenital rubella syndrome: As for the GSVA analysis of CRS, we could not compute IFNγ and IL‐4 + IL‐13 signatures due to the low number of expressed genes, despite analyzing a sufficient number of single cell MCs in both healthy and CRS sets (n = 193 and n = 508) and the similar frequency of zero‐read counts (74.8% vs. 76.8%).