This HMM describes one of several homology families that can be found of mutually closely related lipoprotein signal peptides in the Mycoplasmas and closely related genera (Mesoplasma, Spiroplasma), but absent outside that taxonomic group. Member proteins include spiralin, the most abundant lipoprotein in Spiroplasma.
Jiyao W et al.(2023). "The conserved domain database in 2023.",