CD19

A type of CD which is normally expressed in most B-cells including normal plasma cells. Recall the CD_Mnemonic, "B" for "B-cells" & "Bigger" CDs (CD19, 20, 21, 22, 23, 24) which are typicaly expressed in "B-cells".

Most B-cell lymphoma/leukemias are CD19 positive. In contrast to normal plasma cells which express CD19, most plasma cell neoplasms (e.g. Plasma Cell Myeloma) do not express CD19.