using a specific radioimmunoassay ( ria ) for alpha-rat atrial natriuretic polypeptide ( alpha-ranp ) , we have demonstrated the presence of a considerable amount ( 6.10 +/- 0.38 ng/g ) ( mean +/- se ) of alpha-ranp-like immunoreactivity ( alpha-ranp-li ) in the rat lung , the first organ through which atrial natriuretic polypeptide ( anp ) released from the heart passes .
C0018792
atrial
C0018787
heart