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==Microscopic== | ==Microscopic== | ||
Features:<ref name=Ref_GP396>{{Ref GP|396}}</ref> | Features:<ref name=Ref_GP396>{{Ref GP|396}}</ref> | ||
*Simple epithelium | *Simple epithelium '''key feature''' - usually with cilia. | ||
**Cell morphology: columnar, cuboidal or flatted. | **Cell morphology: columnar, cuboidal or flatted. | ||
*Absent or minimal [[nuclear atypia]]. | *Absent or minimal [[nuclear atypia]]. |
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