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