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This Centers for Disease Control and Prevention (CDC) scientist was performing one of the last steps in a poliovirus testing process. Dyes are used to determine, which of the nucleotides (basis of genetic material) are present in a sequence. The outer coat of the virus (the capsid) is sequenced to find out where the virus has circulated.

This Centers for Disease Control and Prevention (CDC) scientist was performing one of the last steps in a poliovirus testing process. Dyes are used to determine, which of the nucleotides (basis of genetic material) are present in a sequence. The outer coat of the virus (the capsid) is sequenced to find out where the virus has circulated.

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