Both proteins in Fibrimex derives from porcine or bovine blood. These membranes can be obtained from bovine or porcine or dermis. CGFDs have not been observed in feline, equine, bovine, porcine, nor human oocytes. The TRAP gene has been cloned and sequenced in porcine, rat, human, and murine species. Recently, extracts from garden pea have shown inhibitory activity on porcine pancreatic lipase in vitro. Extracts from "Picea abies" have shown inhibitory activity on porcine pancreatic lipase in vitro. PERVS were originally discovered as retrovirus particles released from cultured porcine kidney cells. Most environmental isolates are avirulent; however, isolates recovered from porcine sources contain human pathogenic serogroups. Specifically, the study focused on secretion in porcine theca and granulosa cells, controlling gonadotropic stimulation. Poractant alfa is an extract of natural porcine lung surfactant. SO in porcine coronary artery has been inferred from the reaction products. BCoV has 95% similarity with human coronavirus OC43 and 93% to porcine hemagglutinating encephalomyelitis virus. The durability of homograft valves is probably the same as for porcine tissue valves. Carpentier solved this problem by introducing glutaraldehyde-preserved stent-mounted porcine valves. Other research supports use in porcine epidemic diarrhea virus.