KREMEN1 and epilepsy: In the single-cell analysis of epilepsy, the expression of receptors related to COVID-19 can be categorized into three scenarios: receptors with low expression level, such as ACE and CLEC4M; receptors exhibiting high expression across all cell clusters, such as FUT8 and KREMEN1; and the last category comprises receptors with specific high expression, exemplified by TTYH.