Access to scientific literature is very important for the scientific work in developing countries . As a result of different projects  a large collection of  e-journals is now available for researchers in developing countries. The number of Open Access Journals is growing steadily as we can see in the Directory of Open Access Journals. Major UNO organizations like WHO, FAO and UNEP have their specific programs for the scientific institutions in low-income countries. Finally a lot of universities, institutes and other organizations are supporting access programs. The most important are INASP, eIFL and eJDS.

Nuclear hormone receptor proteins form a class of ligand activated proteins that, when bound to specific sequences of DNA serve as on-off switches for transcription within the cell nucleus. These switches control the development and differentiation of skin, bone and behavioral centers in the brain, as well as the continual regulation of reproductive tissues.