The apparatus 5, comprising {TAIL ~ an automated optical observation system} for detecting and enumerating {HEAD ~ the immobilized entities} 
The apparatus 5 , comprising { TAIL ~ an automated optical observation system } for detecting and enumerating { HEAD ~ the immobilized entities }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD