In a cell free system , binding of a protein fragment ( 771 963 ) containing a stalk region and a tail domain from __SP__ Kinesin heavy chain protein(s) and HSV viral Us11 protein(s) is greater than binding of a protein protein complex consisting of __SP__ __NODE__ and of protein fragment ( 771 963 ) containing a stalk region and a tail domain from __SP__ Kinesin heavy chain protein(s) and HSV viral Us11 protein(s) .