PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 16007391-6 2005 The time vs (13)CO(2) excretion rate curve was mathematically fitted to a conventional formula of y (t) = m*k*beta*e(-k*t)*(1 - e(-k*t))(beta-1), and the parameters of k and beta were determined: under the crossover protocol, a larger (smaller) beta indicates slower (faster) emptying in the early phase, and a larger (smaller) k indicates faster (slower) emptying in the later phase. co(2) 16-21 potassium calcium-activated channel subfamily M regulatory beta subunit 1 Homo sapiens 137-143