<prompt> ALL L3 morophology is a malignancy arising from which cell lineageMature B cellPrecursor B cellImmature T cellMixed B cell T cell  <response>: ALL L3 is arising from mature B cells.Only 1-2 patients with ALL show L3 morphology in which cells are large,have deep cytoplasmic basophilia and prominent vacuolation.These cells show surface immunoglobulin and should be treated as Burkitt lymphoma. Reference:Essential pediatrics-Ghai,8th edition,page no:600. 