The tool is thus lowered against the gel or membrane and pressed with sufficient force to penetrate the gel or membrane without penetrating the intermediate layer, thereby fully excising {HEAD ~ the spot} in {TAIL ~ the form} of a disk from the gel or membrane without also excising any of the intermediate layer 
in
The tool is thus lowered against the gel or membrane and pressed with sufficient force to penetrate the gel or membrane without penetrating the intermediate layer , thereby fully excising { HEAD ~ the spot } in { TAIL ~ the form } of a disk from the gel or membrane without also excising any of the intermediate layer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH