The vacuum anchors the surrounding tissue and mediates against {HEAD ~ the “tenting}” of {TAIL ~ tissue} during electrode penetration 
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The vacuum anchors the surrounding tissue and mediates against { HEAD ~ the “ tenting } ” of { TAIL ~ tissue } during electrode penetration
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH