Tissue is imaged by {HEAD ~ a microscope} capable of imaging sections of {TAIL ~ the tissue} below the exposed tissue surface through optics 
Tissue is imaged by { HEAD ~ a microscope } capable of imaging sections of { TAIL ~ the tissue } below the exposed tissue surface through optics
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH