 Since PLA1 is found in many species, it has been found that there are different classes of this one specific enzyme based on the organism being studied.There are many variations of PLA1, differing slightly between each organism it is present in.Most notably, it can be found in mammalian cells such as plasma of rat livers and bovine brains, and can also be found in metazoan parasites, protozoan parasites, and snake venom.