text: Herpes simplex virus type 1 (HSV-1) encodes a helicase-primase that consists of the products of the UL5, UL8, and UL52 genes (Crute, J. J., Tsurumi, T., Zhu, L., Weller, S. K., Olivo, P. D., Challberg, M. D., Mocarski, E. S. and Lehman, I. R. (1989) Proc. Natl. Acad. Sci. U. S. A. 86, 2186-2189).