The full ORP encodes a 487-amino acid protein with a calculated molecule weight of 53.484 kDa and an isoelectric point of 6.75. At the primary sequence level, it shared high homology with Clr, so was named Clr-like serine protease, CLSP.

• 该蛋白在核酸和氨基酸水平上与人补体组分Cl:表现高度同源，故将其命名为补体Cl:样丝氨酸蛋白酶(旦lr一like旦erineprotease，CLSP)，该基因已经在Ge心ank登录(登录号为AF17s985)。