<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Rui-Ping Xiao</style></author><author><style face="normal" font="default" size="100%">Eric D. Tomhave</style></author><author><style face="normal" font="default" size="100%">Ding-Ji Wang</style></author><author><style face="normal" font="default" size="100%">Xiangwu Ji</style></author><author><style face="normal" font="default" size="100%">Marvin O. Boluyt</style></author><author><style face="normal" font="default" size="100%">Heping Cheng</style></author><author><style face="normal" font="default" size="100%">Edward G. Lakatta</style></author><author><style face="normal" font="default" size="100%">Walter J. Koch</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Age-associated reductions in cardiac β1- and β2-adrenergic responses without changes in inhibitory G proteins or receptor kinases</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Clinical Investigation</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1998</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.ncbi.nlm.nih.gov/pubmed/9502768</style></url></web-urls></urls><pages><style face="normal" font="default" size="100%">1273-1282</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">6</style></issue><custom7><style face="normal" font="default" size="100%">000072754900010</style></custom7></record></records></xml>