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Log10TPD50 values (minimal cell doses for 50% of animals to form a tumor) for HeLa cells when transplanted subcutaneously in various immuno-deficient mouse strains (nude, SCID, NOD-SCID, NOG) with or without Matrigel as indicated. Abscissa, weeks after transplantation. Ordinate, Log10 TPD50 values, logarithmic scale.
