Actinomycin D and 7-aminoactinomycin D were purchased from Sigma (Dorset, UK). Methanol, acetonitrile and acetic acid were obtained from Fisher (Loughborough, UK)
Actinomycin D and 7-aminoactinomycin D werepurchased from Sigma (Dorset, UK). Methanol, acetonitrileand acetic acid were obtained from Fisher(Loughborough, UK)