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Human lymphoblastoid cells (TK6) following 24 h EMS exposure, CD59 antigen utilised as phenotypic PIG-A marker. Day 1–4 frequencies of PIG-A mutant TK6 cells (clonally selected) following 24 h low-dose EMS exposure—CD59 antigen utilised as reporter of mutation (Dunnett’s test; *P < 0.05; n = 3, error bars ±1 SD; 0.1% PIG-A mutants = 1 mutant × 10–3 cells).
