Under certain conditions, some algae are able to produce hydrogen—a much sought-after green energy source. Its production takes place in the unique catalytic center of the unicellular algae and is only possible if certain cofactors of the relevant proteins are present. Under certain conditions, some algae are able to produce hydrogen—a much sought-after green energy source. Its production takes place in the unique catalytic center of the unicellular algae and is only possible if certain cofactors of the relevant proteins are present. Biochemistry Analytical Chemistry Phys.org – latest science and technology news stories