The adapter sequences depend on the gene to detect

The genes to detect are synthesized  on the surface of the flow cells by the manufacturer

The sequence is defined by the color fluorescence code as we move across the flow cell line, against the flow. 

The sequence is defined by the color fluorescence code as we move across the flow cell line, towards the flow. 

None of the above/below

The genes to detect are synthesized  on the surface of the flow cells by the client