Over 300 blood group antigens have been discovered in different parts of the world and most them are classified into 35 systems. India has contributed a few rare blood groups including the Bombay phenotype, Indian blood group antigens like In(a), In5 and I-i- phenotype. Besides, there are a few other rare blood groups, though not discovered in India, were encountered here including a host of the weaker variants of A, B and H antigens, the ultra-rare Mg antigen of the MNS blood groups, phenotypes like D- -, Rh-null, I-int, In(b-), Colton-null and r(y)
Joshi, Sanmukh R.
"Discovery of human blood groups in India,"
Manipal Journal of Medical Sciences: Vol. 3:
1, Article 1.
Available at: https://impressions.manipal.edu/mjms/vol3/iss1/1