Ecosystem diversity, the diversity of a place at the level of ecosystems. Crop diversity, the variance in genetic and phenotypic characteristics of plants used in agriculture. Functional diversity (ecology), the elements of biodiversity that influence how ecosystems function; see diversity-function debate.
Gene therapy is the therapeutic delivery of nucleic acid polymers into a patient's cells as a drug to treat disease. Until September 1990, it had never been successfully done, and it is still an experimental and emerging medical technology.
Antisense therapy is not strictly a form of gene therapy, but is a genetically-mediated therapy and is often considered together with other methods. In most gene therapy studies, a normal gene is inserted into the genome to replace an abnormal, disease-causing gene.