Detection of TPα in the membrane systems of unstimulated platelets using a rabbit polyclonal antibody to the carboxyl-terminal domain.

(A) A typical platelet section. Surface labeling is highlighted (arrows) as is the labeling of thin channels within the OCS (arrowheads). (B-C) Higher-power magnifications showing abundant labeling within the thin channels of the OCS and labeling of the membranes of α-granules (arrows). (D) A labeled α-granule containing a Weibel-Palade–like structure. Bars = 0.1 μm.