Starting in the late 1980s, their labs revealed steps in how the endoplasmic reticulum, the cell's factory for processing secreted and membrane proteins, deals with proteins whose linear sequence of amino acids hasn't folded into a proper 3D shape. (sciencemag.org)
A human genome contains roughly 3 billion nucleotides in linear sequence, and that is the same, again to a large approximation, in every cell type throughout life. (scientificamerican.com)
Written for year 6 algebra in the new National Curriculum (but also suitable at KS3), a differentiated question sheet, with a set of linear sequences for children to solve. (tes.com)