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#2079 abnormal platelet alpha-granule morphology
In J:220801, platelets of mutant mice lack alpha-granules. Based on a web search, alpha-granules are different from dense granules. Alpha-granules are secretory granules that contain growth factors (platelets contain three types of secretory granules: alpha-granules, dense granules, and lysosomes). It looks like we have several annotations that refer to alpha-granules so there is precedence for creating this term (MP: abnormal platelet alpha-granule morphology).