1028
Nine months after the end of the vaccination anti - HBsAg levels had dropped to 9 + / - 4 IU / 1 ( M + / - SE ) , with a geometric mean of 5 IU / 1 , in the nine remaining evaluable patients .
 GENE: anti - HBsAg
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: anti - HBsAg