Isolation of pectin from plant cell walls is achieved by breaking up {HEAD ~ the gel structure}, usually stabilized by {TAIL ~ calcium cations}, to solubilize large aggregates of pectin 
usually stabilized by
Isolation of pectin from plant cell walls is achieved by breaking up { HEAD ~ the gel structure } , usually stabilized by { TAIL ~ calcium cations } , to solubilize large aggregates of pectin
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH