The mitosome is an organelle found in "amitochondrial" unicellular organisms which do not have the capability of gaining energy from oxidative phos...
The subcellular locations in which a protein is found are described in UniProtKB entries with a controlled vocabulary, which includes also membrane topology and orientation terms.
By default, searching the subcellular locations will look for matches in both name and definition. Example queries to search subcellular locations only by name:
Information about the usage of this controlled vocabulary in UniProtKB entries can be found in the user manual.