Term Name:	Fraction A pre-pro B cell
Synonyms:	fraction A, pre pro B cell
Definition:	A pro-B cell that CD45R/B220-positive, CD43-positive, HSA-low, BP-1-negative and Ly6c-negative. This cell type is also described as being lin-negative, AA4-positive, Kit-positive, IL7Ra-positive and CD45R-positive.
Ontology:	Cell Ontology [CL:0002045]