NR4A1 and melanoma: We further analyzed NR4A1 expression within several single-cell RNA sequencing datasets, including human hepatocellular carcinomas (HCC; GEO: GSE98638) (Zheng et al., 2017) and melanomas (GEO: GSE148190, GSE158803) (Mahuron et al., 2020; Nieto et al., 2021; Sade-Feldman et al., 2018).