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stevor and rif are Plasmodium falciparum multicopy gene families which potentially encode variant antigens.

Q. Cheng,N. Cloonan,4 Authors,A. Saul

1998 · DOI: 10.1016/S0166-6851(98)00144-3
Molecular and biochemical parasitology (Print) · 286 Citations

TLDR

The number of copies of stevor and rif, their location close to the var genes, their extreme polymorphism and the predicted structure of the proteins suggest that stev or rif code for variant surface antigens in a larger superfamily.