<prompt> Thromboxane A2,Formed by plateletsFormed from PGG,IPGRProthromboticAll  <response>: Ans. is a i.e., Formed by platelets; b i.e., Formed from PGG2PGH2 ; c i.e., Prothrombotic Thromboxane A2 TXA21 o TXA, is synthesized by platelets from arachidonic acid PGG2 and PGH2 intermediate through cycloxygenase pathway. o It is a potent inducer of platelets aggregation -- prothrombotic activity. o It is a vasoconstrictor. 