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Chromatoplates observed in the thin-layer chromatography assessment of rifampicin samples. A) Lane 1 from the left=upper working limit representing 100% of the total drug; lane 2 from the left = poor-quality drug product with <80% of the drug; lane 3 from the left = good-quality drug product; lane 4 on the right=lower working limit representing 80% of the total drug. B) As above for a rifampicin sample from a different batch.
