血小板胞器如圖所示。胞器①內含von Willebrand factor；胞器②內含serotonin；胞器③內含cathepsin。這三種胞器分別為下列何者？
①α-granule；②Dense granule；③Open canalicular system
①Dense granule；②α-granule；③Weibel-Palade body
①α-granule；②Dense granule；③Lysosome
①Weibel-Palade body；②Dense granule；③Open canalicular system
