Tablets arrive at pharmacies in large packs of 100 or blister packs of 28.

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When the chamber is flipped over like a cake pan, the doses drop into the foil blister packs.

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The company said some blister packs might contain an inexact count of inert or active ingredient tablets and that the tablets might be out of sequence.

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When mechanical engineer James Parks joined Nektar in 1994, employees at the company were hand-filling blister packs with an early version of insulin powder at a rate of 100 per person per day, too slow for mass production.

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