<P> The Human Genome Project produced the first complete sequences of individual human genomes, with the first draft sequence and initial analysis being published on February 12, 2001 . The human genome was the first of all vertebrates to be completely sequenced . As of 2012, thousands of human genomes have been completely sequenced, and many more have been mapped at lower levels of resolution . The resulting data are used worldwide in biomedical science, anthropology, forensics and other branches of science . There is a widely held expectation that genomic studies will lead to advances in the diagnosis and treatment of diseases, and to new insights in many fields of biology, including human evolution . </P> <P> Although the sequence of the human genome has been (almost) completely determined by DNA sequencing, it is not yet fully understood . Most (though probably not all) genes have been identified by a combination of high throughput experimental and bioinformatics approaches, yet much work still needs to be done to further elucidate the biological functions of their protein and RNA products . Recent results suggest that most of the vast quantities of noncoding DNA within the genome have associated biochemical activities, including regulation of gene expression, organization of chromosome architecture, and signals controlling epigenetic inheritance . </P> <P> There are an estimated 19,000 - 20,000 human protein - coding genes . The estimate of the number of human genes has been repeatedly revised down from initial predictions of 100,000 or more as genome sequence quality and gene finding methods have improved, and could continue to drop further . Protein - coding sequences account for only a very small fraction of the genome (approximately 1.5%), and the rest is associated with non-coding RNA molecules, regulatory DNA sequences, LINEs, SINEs, introns, and sequences for which as yet no function has been determined . </P> <P> In June 2016, scientists formally announced HGP - Write, a plan to synthesize the human genome . </P>

Approximately what percentage of human dna does not code for proteins
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