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Simple sequences, which are situated in chromosomes(grSO) largely but not entirely in the heterochromatin(_gr(), are usually not transcribed. Another class of repetitive sequences, the so-called "intermediate repetitive", have much longer and less regular repeats. Such sequences are interspersed with "unique" DNA at many places in the chromosome, the precise pattern of interspersion being to some extent different in different species.Leaving aside genes which code for structural RNA of one sort or another (such as transfer RNA and ribosomal RNA), which would be expected to occur in multiple copies (since, unlike protein, their final products are the result of only one stage of magnification, not two), the majority of genes coding for proteins appear to exist in "single" copies, meaning here one or a few. A typical example would be the genes for -globin(tˆ}v), which occur in one to three copies and the human -like globins, of which there are four main types, all related to each other but used for slightly different purposes. Notable exceptions are the proteins of the immune system, and probably those of the histocompatibility(~~v['`) and related systems. Another exception is the genes for the five major types of histone which also occur in multiple copies. Even allowing for all such special case, the estimated number of genes in the human genome appears too few to account for the 3109 base pairs found per haploid(USPSO) set of DNA, although it must be admitted that all such arguments are very far from conclusive.EEF.FXFZFFFFF`GbGnGGGlHnH~HHzJWDXD2`gd$WDXD2`a$gddgdbgdbgd$a$gddgd dXD2gddgdZFbFfFnFpFFFFFFFFFFFFFFFFFG GG&G(G6GDG^G`GҽҶwrhahahrWaWrWahEh>*o( h>*o(hM->h>*o( ho(hh5aJo(hvMFh5aJo(h5B*aJo(phhvMFh5B*aJo(phhvMFhaJo(haJo()h5B*CJ OJPJQJaJ o(ph/hf~h5B*CJ OJPJQJaJ o(ph)h5B*CJ OJPJQJaJ o(ph`GbGnG~GGGGGGGlHnH|H~HHzJzN0QTVWWWWWWWWWWWWzvzvzvzvh"jh"U h>*o(hhCJo(hh#$CJo(hh#$CJhh#$5hh5hh5o( hbo(hvhb>*CJh#$hbo( ho( h#$hbh#$hb5B*aJphhb5B*aJo(phzJ0OTWWWWWWWWWWWWgdigdWDXD2`gd0182P. A!"#$%S 0182P. A!"#$%S 0182P. A!"#$%S 0182P. A!"#$%S 0182P. A!"#$%S 0182P. A!"#$%S 0182P. 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