The column may then be inverted and irrigated internally with {HEAD ~ a wash buffer} to remove unhomogenized macroscopic tissue material and {TAIL ~ unbound residual cells} 
to remove
The column may then be inverted and irrigated internally with { HEAD ~ a wash buffer } to remove unhomogenized macroscopic tissue material and { TAIL ~ unbound residual cells }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL