n05389460
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<synset id="n05389460" type="n"> <lex_filenum>08<lex_filenum/> <word lex_id="0">pacemaker<word/> <word lex_id="0">cardiac pacemaker<word/> <word lex_id="0">sinoatrial node<word/> <word lex_id="0">SA node<word/> <pointer refs="n05389939">Hypernym<pointer/> <def>a specialized bit of heart tissue that controls the heartbeat<def/> <synset/>