{HEAD ~ The extractor} comprises {TAIL ~ a microporous dialysis membrane tube} filled with cation or anion exchange resin beads 
comprises
{ HEAD ~ The extractor } comprises { TAIL ~ a microporous dialysis membrane tube } filled with cation or anion exchange resin beads
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH