div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Attenuation of Mengo virus through genetic engineering of the 5′ noncoding polyC tract src=https:reader031fdocumentsnetreader031viewer2022020523575068801a28ab0f07b0746bhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1990 Nature Publishing Grouppdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: Attenuation of Mengo virus through genetic engineering of the 5′ noncoding polyC tract src=https:reader031fdocumentsnetreader031viewer2022020523575068801a28ab0f07b0746bhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divp© 1990 Nature Publishing Grouppdivdiv class=trans-pagebuttonPage 3button div class=trans-image amp-img class=trans-thumb alt=Page 3: Attenuation of Mengo virus through genetic engineering of the 5′ noncoding polyC tract src=https:reader031fdocumentsnetreader031viewer2022020523575068801a28ab0f07b0746bhtml5thumbnails3jpg width=142 height=106 layout=responsive amp-img divp© 1990 Nature Publishing Grouppdiv