has part has part has_part characteristic of has modifier platelet alpha granule abnormal platelet morphology abnormal platelet alpha-granule morphology abnormal platelet alpha granule morphology MP:0014060 any structural anomaly of the most abundant secretory organelle found in blood platelets, and which store adhesive molecules such as von Willebrand factor and fibrinogen, growth factors and inflammatory and angiogenic mediators, which play crucial roles in inflammatory responses and tumor genesis morphology abnormal