The antithrombin of subgroup Ia individuals showed a normal affinity for heparin while the antithrombin of subgroup Ib individuals showed a reduced affinity for heparin .
DET NOUN ADP NOUN PROPN NOUN VERB DET ADJ NOUN ADP NOUN SCONJ DET NOUN ADP NOUN PROPN NOUN VERB DET ADJ NOUN ADP NOUN .