<prompt> ALL L3 morphology is a malignancy arising from which cell lineageMature B cellPrecursor B cellImmature T cellMixed B cell T cell  <response>: Cellular classification of ALL French-American-British FAB system divides ALL into three morphological subtypes.i LI lymphoblastsMost common type 80-85Cells have scanty cytoplasm and inconspicuous nucleoli.Have better prognosisii L2 lymphoblastsCells are large and more pleomorphic in size with more abundant cytoplasm and prominent nucleoli.iii L3 - lymphoblastLeast commonMorphology is identical to urkitts lymphoma cells i.e., mature B cells with surface immunoglobulin positive. 