But if the yeast's Golgi has different ideas from a human's about how to package that protein, the result may not work well as a drug.

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That generic versions of high-tech protein drugs such as human growth hormone, insulin, or Amgen 's Epogen are likely to reach the market with any great speed.

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That generic versions of high-tech protein drugs such as human growth hormone, insulin, or Amgen 's (nasdaq: AMGN - news - people ) Epogen are likely to reach the market with any great speed.

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But gp120's innards are exposed for 30 minutes or so while the protein is hooked to its human receptor, called CD4, in preparation to invade a cell.

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