And so when we transplant an organ or tissue from one twin from one of the twins to different twins this will create very little complication and the immune system will accept that organ. Now of course these instances are actually very rare because not always do we have a twin and not always can we actually transplant an organ because we only have one of each organ not including things like our lungs or our kidneys. Now, two very common methods, much more common methods than what we just discussed are tissue typing and immunosuppression. Now, tissue typing is actually a pretty complicated process so we're not going to go into too much details. But what tissue typing basically is it's a process of determining the type of major histocompatibility complexes and a type of self antigens that are found within that host individual. And then finding the exact match or a very similar match, a compatible match from another individual that contains very similar MHC antigen complexes.