P791: COMMON VARIANTS IN COMPLEMENT PROTEINS, C3 AND CR1, ENHANCE COMPLEMENT ATTACK ON PNH ERYTHROCYTES AND INCREASE RISK FOR EXTRAVASCULAR HAEMOLYSIS. (23rd June 2022) - Baral, A. J.; Mckinley, C.; Fellows, R.; Hallam, T.; Cox, T.; Payne, D.; Richards, S.; Pike, A.; Kelly, R.; Griffin, M.; Hillmen, P.; Marchbank, K.; et al.