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pH stability of the bacteriophages (a) vB_KpnP_K3-ULINTkp1 and (b) vB_KpnP_K3-ULINTkp2 after 1 h of pH treatment at 25 °C. The mean value of 3 titrations (±σ) is represented and the concentration measured before testing is represented with dark bars. p-value (*) ≤ 0.05.
