A flow cell of {HEAD ~ the type} that may be used in the synthesis of arrays of {TAIL ~ DNA probes} and the like, comprising: 
A flow cell of { HEAD ~ the type } that may be used in the synthesis of arrays of { TAIL ~ DNA probes } and the like , comprising :
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH