For a chemist to swap generics, we verify they are identical small molecules—like swapping sugar brands. Biosimilars are complex proteins from living cells; even tiny differences in folding can trigger an unwanted immune response—immunogenicity. My years reviewing dossiers taught me that with biologics, the process is the medicine, unlike simple tablets. Watching my son study biotech in Mysore, I see his textbooks echo this: life’s molecules demand more care than chemical ones.
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