Q: In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
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 .
A:
aspartate aminotransferase