{TAIL ~ Specificity} means the ability of the membrane to selectively bind or filter certain species from {HEAD ~ complex mixtures} 
{ TAIL ~ Specificity } means the ability of the membrane to selectively bind or filter certain species from { HEAD ~ complex mixtures }
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD