=== Modern Virology, Dimmock, 2007 ===
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p139 s9.5 Herpesviruses HSV1: 70 genes, 153kbp 
 . α immediate early phase       β early       γ late

p141: UL41   VHS = virion host shutoff.  A ribonuclease that degrades cytoplasmic mRNA that is being translated.  Decreases the half-life of all mRNA in the cell, favoring protein expression from viral genes that are being actively transcribed.  Later, a more specific host shutoff function ('''''what'' function???''')  is expressed, and UL41 is inactivated by binding to VP16.
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=== Basic Virology, Wagner, 2008 3rd Ed ISBN 978-1-4051-4715-6 ===
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used, around $40