Protease activated receptors regulate prostaglandin E2 production in human fetal lung fibroblasts cultured in three-dimensional collagen gels  
Wang Jing, Li Ji-hong, Zhang Jie, Fang Qiu-hong, Ma Ying-min
Chinese Journal of Tissue Engineering Research . 2010, (28): 8172 -5176 .  DOI: 10.3969/j.issn.1673-8225.2010.28.010