sentence: Our previous results showed that AT detached from the heparin affinity column at a high-salt elution of 0.6 M NaCl , while LMWP at 0.94 M NaCl and protamine at 1.3 M NaCl.18 Hence , LMWP fits neatly into the elution frame , with a much stronger affinity to heparin than AT , but less than protamine .