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