On October 25, the regular scientific seminar was held at the Institute of Molecular Biology and Biotechnologies. Senior laboratory assistant of the Photobioenergetics laboratory Esmira Karimli delivered a seminar on "Bc1 complexes of bacteria, mitochondria, and chloroplasts". The speaker provided information on the subunit composition, structure, and functions of bc1 type complexes in various organisms, which are one of the main components of energy conversion systems of biological organisms. The speaker provided information on the subunit composition, structure, and functions of bc1 type complexes in various organisms, which are one of the main components of energy conversion systems of biological organisms. The young researcher spoke about diseases observed in humans as a result of bc1 complex deficiencies. She noted that deficiencies in the bc1 complex are most often associated with mitochondrial DNA mutations encoding cytochrome b. The only known patient mutations in nuclear genes encoding the structural subunits of the bc1 complex occur in the SU7 (UQCRB, in yeast Qcr8) [123] and SU6 (UQCRQ in yeast, Qcr7) genes.