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What is it?
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Residue from the missing boy's room.
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Oh, without the Mass Spec,
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what am I supposed to do with it?
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I don't know. Be creative.
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Russell has me doing ABO blood typing. Want to help?
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Sure. Tonight, everything old is new.
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Alright.
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I got clumping.
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- You? - Yeah.
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Based on the Band-Aid exemplar,
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the boy's blood type is O.