Marine myxobacteria are relatively uncommon compared to terrestrial myxobacteria, such as "P. pacifica"'s relative "N. exedens". Studies of the salt adaptation of marine myxobacteria have found that "P pacifica" accumulates exogenous amino acids from its environment as osmoprotectants, in contrast with the marine myxobacterium "Enhygromyxa salina", which express genes for the synthesis of endogenously produced osmoprotectant molecules. Myxobacterial genomes typically have high GC content; in "P. pacifica" the GC content is 69-70%. Comparative genomics studies have identified myxobacteria and specifically "P. pacifica" as possessing an unusual kinome, with a high number of distinct "eukaryotic-like" serine/threonine and tyrosine kinase genes. These kinases are common regulatory proteins in eukaryotes, but are relatively rare in prokaryotes. The functions of these kinases in myxobacteria are unclear. Similar bioinformatic analysis has identified a large number of genes in the "P. pacifica" genome associated with sterol production, which is quite rare among prokaryotes but ubiquitous in eukaryotes. There is evidence that at least some of the sterol-associated genes in "P. pacifica" derive from horizontal gene transfer from eukaryotes.