Table 1. Putative cell types identified using the polytomous cell identification key.

Staining Pattern	Putative cell type	References
ACTA2-;VIM+PTPRC-	Other	-
ACTA2+;VIM+PTPRC+	Fibrocyte	[18–22]
ACTA2+;AR+	AR+ Periductal Smooth Muscle Myocyte	[23–29]
ACTA2+;AR-	AR- Periductal Smooth Muscle Myocyte
ACTA2+;VIM+;S100A4+	Myofibroblast	[24,30–32]
ACTA2-;VIM+;S100A4+	Fibroblast	[19,33–35]
ACTA2-;VIM+;PTPRC+	Other Hematolymphoid Cells	[36]
ACTA2-;VIM-;PTPRC+
ACTA2-;VIM-;PTPRC-	Other	-
MBP+;TUBB3-	Schwann Cell	[37,38]
MBP-;TUBB3+	Nerve	-
TH+;TUBB3+	Adrenergic Nerve	[39–41]
TH-;TUBB3-	Other	-
CGRP+;TUBB3+	Sensory Nerve	[42–46]
CGRP-;TUBB3+	Other	-
SLC18A3-;TUBB3+	Cholinergic	[39,40,47]
SLC18A3-;TUBB3+	Other	-
SYP-;KRT5+;KRT8/18-	Basal Cell	[48]
SYP-;KRT5-;KRT8/18+	Luminal Cell	[48]
SYP+;KRT5-;KRT8/18-	Neuroendocrine Cell	[49,50]
SYP-;KRT5+;KRT8/18+	Intermediate Cell	(48)