rhesus monkeys , macaca mulatta , were treated with the oral contraceptives brevicon ( norethisterone with ethinylestradiol ) and ovral ( norgestrel with ethinylestradiol ) , and subsequently inoculated with the simian malaria parasites plasmodium cynomologi bastianellii or p. coatneyi .
C0107153
brevicon
C1260235
norethisterone