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<p>290 <a href="page.php?w=kilobase">kilobase</a>s. Several <a href="page.php?w=alternative_splicing">alternative splicing</a> isoforms of APP have been observed in humans, ranging in length from 639 to 770 amino acids, with certain isoforms preferentially expressed in neurons; changes in the neuronal ratio of these isoforms have been associated with Alzheimer's disease. <a href="page.php?w=Homology_%28biology%29">Homologous</a> proteins have been identified in other organisms such as <a href="page.php?w=Drosophila">Drosophila</a> (fruit flies),</p><p>
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