with a woman who is donating to a man whose relative was willing to donate for him but was not come patible. that relative donates to someone she doesn't know. that patient has a relative who is willing to donate to someone else and on and on. this continues four more times. the staff at california medical center held a press conference to explain the complexity of it all including the reasoning for doing these back-to-back operations. >> one donor had a sore throat and if any of the 12 has a medical problem the whole thing falls apart and we have to regroup. >> this pairing is very complicated. they were able to achieve it in a quick way than to software called match grid developed by david jacobs, a 2003 kidney recipient and he use as sophisticateed we program that take as profile of genes and finds potential matches and shaves down the team it usually takes to create the matches. the surgery starts today. there are more surgeries tomorrow. >>> thank you. police are searching for two suspects following a highway shooting that led to a traffic nightmare for commuters at 4:00 yesterday on e