There is precedent for this: λ can utilize either Redα or RecA to mediate recombination by SSA or HR [57], [70], [71], [72], [73], [74], [75] and human cytomegalovirus (HCMV) has recently been reported to increase HR during infection by a mechanism that is mediated by the immediate early protein IE1–72 [76]. Here, PROS1 is linked to infection.