Figure 6From: Evolution of S-domain receptor-like kinases in land plants and origination of S-locus receptor kinases in BrassicaceaeProposed model for the evolution of the ancient two-haplotype SRK system. The duplication and diversification of the common ancestor of Brassicaceae SRKs, A_SRK, generated two tandem duplicate genes A_SRKI and A_SRKII. Random sub-/neo-functionalization of A_SRKI and A_SRKII produced the postulated two-haplotype system of two ancient SRK haplotypes SRKI and SRKII.Back to article page