Mid-logarithmic cultures consisting of a 1:1 ratio of the competiting Ara+ and Ara–strains were irradiated to 2000 and 3000 Gy and plated on tetrazolium arabinose indicator plates to distinguish the frequency of survival for both strains. (A) CB2000 Ara– (red, ^), vs CB2000 wtRecA wtDnaB wtYfjK, ☐ (B) Founder Δe14 Ara−, (red, △), vs Founder Δe14 RecA D276N DnaB P80H YfjK A151D, ◇ (C) TA plate of 2000 Gy survival competition of Founder Δe14 Ara−vs Founder Δe14 RecA D276N DnaB P80H YfjK A151D. The two red Founder Δe14 Ara–colonies are indicated by red arrows. (D) Founder Δe14 Ara− (red, ◇), vs CB2000 wtRecA wtDnaB wtYfjK, ☐. (E) Log advantage in survival to 2000 Gy of CB2000 Ara−over CB2000 wtRecA wtDnaB wt YfjK (in black), Founder Δe14 RecA D276N DnaB P80H YfjK P80H over Founder Δe14 Ara− (in grey), and CB2000 wtRecA wtDnaB wt YfjK over Founder Δe14 Ara− (in white).