<prompt> Alpha granules of platelates contain all except ?FirinogenTGF-bPDGFADP  <response>: Ans. is d i.e., ADP Platelets contain two specific types of granules : ? Alpha granule - Contains fibrinogen, fibronectin, factors V VIII, PDGF, TGF-b and platelet factor 4. Dens bodies or Sgranules -Contain ADP, Ca2, histamine, serotonine, and epinephrine. 