<prompt> B cell marker are all except:CD 19CD 20CD 10CD 135  <response>: B cell associated markers are CD 10,CD19,CD20,CD21,CD22 and CD23. CD 135 is a proto oncogene.it is also the receptor for the cytokine Flt3 ligand and has the presence of tyrosine kinase activity.its mutation can lead to acute myelogenous leukemia and is associatedwith a poor prognosis.ref Robbins 9e590,8th 600 