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Cell viability determined in an MTT assay with M21 (left), M21‐L (right) cells after treatment with Cry‐55gly (7), cyclo[DKP‐RGD]‐cryptophycin and cyclo[DKP‐isoDGR]‐cryptophycin conjugates. Curves were obtained by non‐linear regression, error bars represent the standard deviation of triplicate measurements, the measurements were repeated twice.
