4270
As much thrombin was formed during cardiopulmonary bypass ( measured by the prothrombin activation fragment F1 + 2 and thrombin - antithrombin complexes ) as in normal patients , showing that factor XII was not necessary for thrombin generation .
 GENE: thrombin; GENE: prothrombin activation fragment F1 + 2; GENE: thrombin; GENE: antithrombin; GENE: factor XII; GENE: thrombin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: thrombin; GENE: prothrombin activation fragment F1 + 2; GENE: thrombin; GENE: antithrombin; GENE: factor XII; GENE: thrombin