{TAIL ~ Masks} can be used to form a pattern of {HEAD ~ crosslinked and non crosslinked regions} on a surface 
{ TAIL ~ Masks } can be used to form a pattern of { HEAD ~ crosslinked and non crosslinked regions } on a surface
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH