This month, the two flagship biology journals of BioMed Central, Journal of Biology and BMC Biology, join forces under the title BMC Biology, as a journal whose aim is to maintain and develop the strengths of both. We have chosen the title BMC Biology not as a signal of the predominance of that journal over Journal of Biology, but to affirm the connection of the fused publication with BioMed Central, and its close relationship with its sibling journals of the BMC series (see ). But we like the genetic principle of codominance; and of course hybrid vigor.
That said, the fused publication will look and behave more like Journal of Biology than BMC Biology in most ways. We shall continue to publish the topical and authoritative review and comment that have regularly appeared in Journal of Biology, which will also bring its publication policy and speed of response to the fused journal (more on policy below). But listing on the Web of Science and Journal Citation Record will be as BMC Biology.
In combining two journals, we are swimming against the tide of ever-proliferating new journals, a point remarked by Gregory Petsko in a Comment  written for us to mark the occasion and in which, with the verve and effrontery with which regular readers of his column in our sister journal Genome Biology will be familiar, he deplores such proliferation - inviting, perhaps, dissent. But we agree of course that this particular fusion is rational.
In the combined journal, what is new, and what is not?