HCG22 and Alzheimer disease: We found in a human dataset that the AD‐associated lncRNA HCG22 controls similar genes to H2‐Q5 based on a guilt‐by‐association approach, indicating that lncRNA expression from the MHC/H2 locus is modulated by and may coordinate microglia‐T‐cell interaction during AD pathology (Dai and Shen 2021).