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![and a few remarks about future work, i & VB'fL J T ] a b UlU*\ It is easiest to begin by considering an imaginary example. The upper part of Figure 1 shows schematically length of DNA which codes for a single messenger RNA. The lower part shows the base sequences found in that messenger RNA. The relationship between the two is indicated by the lines connecting them. The figure shows that in this case there are two fairly long stretches of base sequence along the DNA of the gene which do not appear iw final messenger RNA.. Such sequences are now known as intervening sequences, terminology, suggested by Gilbert, refers to the intervening end up in the messenger RNA are referred to as exons since they are the ones which are expressed. Air stage any terminology is likely to lead^to difficulties and complications. In this article I shall use Gilbert's terminology if only for want of a s. //wh. better one.JjVlhat possible mechanisms are there which could have produced this result? There at least four which immediately spring to mind. 1) The DNA in the cell producing the message might be eujr jfCò Q? UJ](https://iiif.wellcomecollection.org/image/b18166829_PP_CRI_H_6_14_1_0002.jp2/full/800%2C/0/default.jpg)
