<prompt> ALL , morphology is a malignancy arising from which cell lineage -Mature B cellPrecursor B cellImmature T cellMixed B cell T cell  <response>: Acute Lymphoblastic Leukemia Lymphoma ALLs are neoplasms composed of immature B pre-B or Tpre-T cells ,which are referred to as lymphoblasts. Ref :Robbins pathologic basis of disease ; south east asia edition ;pg:590 