Term Name:	T1 B cell
Synonyms:	T1 B lymphocyte, T1 B-cell, T1 B-lymphocyte, transitional stage 1 B cell
Definition:	A transitional stage B cell that migrates from the bone marrow into the peripheral circulation, and finally to the spleen. This cell type has the phenotype surface IgM-positive, surface IgD-negative, CD21-negative, CD23-negative, and CD62L-negative, and CD93-positive. This cell type has also been described as IgM-high, CD19-positive, B220-positive, AA4-positive, and CD23-negative.
Ontology:	Cell Ontology [CL:0000958]