The first ten of N terminal amino acid sequence of 12 000 protein in GCF was Met, Leu, Thr, Glu, Leu, Glu, Lys, Ala, Leu, Asn.

• 龈沟液中低相对分子质量的 12 0 0 0蛋白N 末端 10个氨基酸的顺序为 :Met、Leu、Thr、Glu、Leu、Glu、Lys、Ala、Leu、Asn。