 Today, OUP reserves "Clarendon Press" as an imprint for Oxford publications of particular academic importance.OUP as Oxford Journals has also been a major publisher of academic journals, both in the sciences and the humanities; it publishes over 200 journals on behalf of learned societies around the world.It has been noted as one of the first university presses to publish an open access journal ("Nucleic Acids Research"), and probably the first to introduce Hybrid open access journals, offering "optional open access" to authors to allow all readers online access to their paper without charge.