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