August 2017 cover
Finding a distinct methanogen archaeal lineage from hypersaline lakes. Image by D. Y. Sorokin; cover design by Samantha Whitham.
A pinch of salt
Methanonatronarchaeia are a distinct class-level lineage of extremely halophilic methanogens, which lack features of classical methanogenesis and have a high intracellular concentration of potassium, suggesting potassium-based osmoprotection.
Refers to "Discovery of extremely halophilic, methyl-reducing euryarchaea provides insights into the evolutionary origin of methanogenesis" by Sorokin et al.