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