Of the antibacterial agents examined , only carbenicillin and , to a lesser extent , gentamicin were active against the bacteria usually encountered whilst still permitting normal protoplast metabolism and regeneration .
The use of antibiotics in the culture of non-sterile plant protoplasts. The use of antibiotics to control infections in cultures of protoplasts of leaf mesophyll cells has been examined. The antifungal agents nystatin and amphotericin B were non-toxic to protoplasts at concentrations that controlled fungal growth (25 units and 2.5 μg/ml respectively). Of the antibacterial agents examined , only carbenicillin and , to a lesser extent , gentamicin were active against the bacteria usually encountered whilst still permitting normal protoplast metabolism and regeneration . The most satisfactory control of contaminating microorganisms was obtained with a combination of nystatin (25 units/ml) or amphotericin B (2.5 μg/ml) and carbenicillin (250 μg/ml).
### Instruction:
            Given the context about compound efficacy for the given treatment mentioned within the input, mentioned the compounds 
            that can co-occur for the mentioned treatment

            ### Input:
            The use of antibiotics in the culture of non-sterile plant protoplasts. The use of antibiotics to control infections in cultures of protoplasts of leaf mesophyll cells has been examined. The antifungal agents nystatin and amphotericin B were non-toxic to protoplasts at concentrations that controlled fungal growth (25 units and 2.5 μg/ml respectively). Of the antibacterial agents examined , only carbenicillin and , to a lesser extent , gentamicin were active against the bacteria usually encountered whilst still permitting normal protoplast metabolism and regeneration . The most satisfactory control of contaminating microorganisms was obtained with a combination of nystatin (25 units/ml) or amphotericin B (2.5 μg/ml) and carbenicillin (250 μg/ml).

            ### Response:
            carbenicillin, gentamicin
            