<prompt> Bence jones proteins are -Heavy chain IgGPresent in bone marrowSeen in lymphomaLight chain IgG  <response>: About two-third cases of multiple myeloma excrete Bence Jones peotein i.e, light chain Ig G in the urine. Bence Jones proteins are paraproteins or abnormal immunoglobulins or their pas circulating in plasma excreted in urine.Reference :Harsh mohan textbook of pathology sixth edition pg no 383. 