to identify which viral core protein ( nucleocapsid protein , p1 , p2 , or p3 ) recognizes the cap 1 structure on the rna primer , we irradiated ( uv ) endonuclease reactions carried out by viral cores in the absence of ribonucleoside triphosphates , with a primer rna labeled in its cap 1 structure with ( 32 ) p .
C0042706
viral core protein
C0524816
nucleocapsid protein