Subsequent experiments identified the adhesion domain of HGP44, an arginine-specific cysteine proteinase (gingipain) produced by P. gingivalis, as the component responsible for inhibiting HIV entry.

• 随后的试验证实，粘合结构域HGP44（牙龈卟啉菌产生的精氨酸特异性半胱氨酸蛋白酶）是抑制HIV侵入的功能机构。