ATOH1 and Merkel cell skin cancer: Seventeen unique transcriptional clusters were identified (resolution = 0.75), the majority of which (clusters 0–6, 8–10, and 12–15, representing 89.4% of all cells) were broadly categorized as MCC, as defined by the expression of ATOH1, SOX2, KRT20, and the NE markers SYP, CHGA, and NEFH (Figure 2B).