The pipette is cleaned thoroughly between {HEAD ~ dispenses} and aspirations by flushing with {TAIL ~ a PBS solution} 
The pipette is cleaned thoroughly between { HEAD ~ dispenses } and aspirations by flushing with { TAIL ~ a PBS solution }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL