EF-Ts (elongation factor thermo stable) is one of the prokaryotic elongation factors. It is found in human mitochondria as TSFM. It is similar to eukaryotic EF-1B.
^Kawashima T, Berthet-Colominas C, Wulff M, Cusack S, Leberman R (February 1996). "The structure of the Escherichia coli EF-Tu.EF-Ts complex at 2.5 A resolution". Nature. 379 (6565): 511–8. doi:10.1038/379511a0. PMID8596629. S2CID4273375.