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"content": "American biochemist Florence Seibert died #OTD in 1991.\n\nAt age three, Florence contracted polio. She had to wear leg braces and walked with a limp throughout her life. She is best known for identifying the active agent in the antigen tuberculin as a protein, and subsequently for isolating a pure form of tuberculin, purified protein derivative (PPD), enabling the development and use of a reliable TB test. \n\nhttps://en.wikipedia.org/wiki/Florence_B._Seibert\n\n#science #biochemistry #womeninscience\nhttps://files.mastodon.social/media_attachments/files/113/010/654/141/892/608/original/6e3fde934110dd3e.jpg\n",
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