Assertion: epithelium's cell | /r/HasProperty | rare
Facets:
value: in the ducts
type: LOCATION
Source sentences:
text: At postnatal day 4, dendritic-shaped Cx3cr1+MHCII− cells were present at the distal tips but were rare in the ducts, and dendritic-shaped Cx3cr1+MHCII+ cells were more widespread by day 7 (Extended Data Fig.
text: Developmentally, mammary gland epithelium is constantly produced and maintained by rare epithelial cells, dubbed as mammary progenitors which are ultimately thought to be derived from tissue-resident stem cells.[citation needed]