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Comparison of the cos regions of ϕRSY1, ϕRSX, and ϕRSA1 with phage P2. Bases shared by phages within the 55-bp core sequence (Ziermann and Calendar, 1990) are shaded. Downward and upward vertical arrows indicate the cos cleavage sites. The exact cohesive ends of ϕRSY1 and ϕRSX are unknown.
