{HEAD ~ The region} of reduced hydrophobicity can be {TAIL ~ a hydrophilic region} or a superhydrophilic region 
{ HEAD ~ The region } of reduced hydrophobicity can be { TAIL ~ a hydrophilic region } or a superhydrophilic region
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH