Inside the chambers the sample mixes with a freeze-dried bead of a chemical reagent designed for a particular test.

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It had developed only eight reagent beads--enough for glucose and liver function, for example, but not enough to measure chloride or potassium.

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Abaxis still didn't have the right reagent beads for human tests.

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In some cells (like the thin film CdTe ones) the target metals are indeed in a thin film which could conceivably be washed off with the right reagent.

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The shavings were then immunostained bathed in a special reagent that would mark the presence of abnormal proteins with a bright, telltale red or brown stain on the surface of the tissue.

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