A Na pump with reduced stoichiometry is up-regulated by brine shrimp in extreme salinities. - Artigas P; Meyer DJ; Young VC; Spontarelli K; Eastman J; Strandquist E; Rui H; Roux B; Birk MA; Nakanishi H; Abe K; Gatto C (Proceedings of the National Academy of Sciences of the United States of America, 2023)