Comparison of sequences of COXVI, cytochrome C1, COXX and COXVIII from a selection of protozoa (T.b., T. brucei; T.cz, T. cruzi; Leish, Leishmania major, Bc, Bodo caudatus or Eug, Euglena). In each case, sequences are derived from database searches for homologues of the mature N-terminus of cytochrome c oxidase subunits determined by Speijer et al., 1996 (shown in bold type). Cytochrome C1 sequences are derived from Priest et al. (1993).