We thus analyzed the hippocampal transcripts of miR‐128 host genes in mice, which showed no differences in R3HDM1 and ARPP21 mRNA levels between wild‐type and AD transgenic mice (Figure S6b), indicating a poor correlation between the transcription of miR‐128 and its host genes in AD transgenic mice. The gene discussed is ARPP21; the disease is Alzheimer disease.