<prompt> Which of the following statement is true in cytochemistry of ALLPAS positive Block positivityMyeloperoxidare positiveSudon Black B positiveNon specific estesare positive  <response>: Solution:In L1 and L2 sub types of ALL B cell - ALL PAS positive Blocker are seen in Lymphoblasts on clear Cytoplasmic background.In T Cell - ALL and in L3 Sub type of ALL. PAS reaction is negative. 