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