Gorgonids yield chemicals like prostaglandins, medically useful for birth control, prevention of peptic ulcers, treatment of asthma, regulation of blood pressure, etc. Sponges are used to obtain substances with biomedical properties. Live animals, particularly primates, are used as experimental animals in the biomedical trade. Commonly used species in the past were the rhesus macaque (Macaca mulatta) and the crab eating macaque (Macaca fascicularis). Other species used in biomedical research even today are the squirrel monkeys (Saimiri spp.), marmosets (Saguinus spp.), the night monkey (Aotus trivigatus) and the chimpanzee (Pan troglodytes).