A Novel Serpin with Antithrombin-Like Activity in Branchiostoma japonicum: Implications for the Presence of a Primitive Coagulation System Chao, Yeqing ; Fan, Chunxin ; Liang, Yujun ; Gao, Bei ; Zhang, Shicui Abstract Publication: PLoS ONE Pub Date: March 2012 DOI: 10.1371/journal.pone.0032392 Bibcode: 2012PLoSO...732392C