The ninR region of phage lambda contains two recombination genes, orf (ninB) and rap (ninG), that have roles when the RecF and RecBCD recombination pathways of E. coli, respectively, operate on phage lambda [1]. NinB binds to single-stranded DNA [2].

1: Gene products encoded in the ninR region of phage lambda participate in Red-mediated recombination. Tarkowski TA, Mooney D, Thomason LC, Stahl FW; Genes Cells 2002;7:351-363. PMID:11952832

2: Functional similarities between phage lambda Orf and Escherichia coli RecFOR in initiation of genetic exchange. Maxwell KL, Reed P, Zhang RG, Beasley S, Walmsley AR, Curtis FA, Joachimiak A, Edwards AM, Sharples GJ; Proc Natl Acad Sci U S A. 2005;102:11260-11265. PMID:16076958