Members of this family are lipoprotein LipL21, as described in Leptospira interrogans serovar Copenhageni str. Fiocruz L1-130 but found broadly in the genus Leptospira. Close homologs that are not lipoproteins by sequence are likely defective in their reported coding region.
Jiyao W et al.(2023). "The conserved domain database in 2023.",