# Chemistry and imaging on the NextSeq 1000/2000
The NextSeq 1000/2000 uses 2-channel chemistry, similar to the NextSeq 500/550, MiniSeq, and NovaSeq 6000. However, instead of using red and green channels, the NextSeq 1000/2000 uses blue and green. Using blue instead of red allows for greater resolution of tightly packed nano wells of the NextSeq 1000/2000 flow cells.
Figure 1: Representation of Standard chemistry dye by nucleotide.\
Figure 2: Representation of NextSeq 1000/2000 XLEAP chemistry dye by nucleotide.\
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