The Hindu is reporting the successful completion of India's largest ever "domino" kidney transplant: a chain of transplants in which A's relative donates a kidney to B, B's relative donates one to C, C's to D, and so on, until (in this case) F's relative completes the chain by donating a kidney to A. 12 patients (6 donor-recipient pairs) were operated on. Doctors at Johns Hopkins did a similar set of procedures in 2009. Physicians in Mumbai completed a 5-family domino donation last year; an earlier attempt at a 5-family donation failed when one of the 5 prospective recipients died. In 2012, doctors in 11 different American states completed the largest domino donation chain ever, involving 30 donor-recipient pairs.