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This paper describes a longitudinal study in which clinical parameters and aspartate aminotransferase ( AST ) in gingival crevicular fluid ( GCF ) were monitored bimonthly over a 6 - 12 months period in 970 sites from 7 treated periodontitis patients .
 GENE: aspartate aminotransferase; GENE: AST
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: aspartate aminotransferase; GENE: AST