The size of a synthesized protein can be measured by the number of amino acids it contains and by its total molecular mass , which is normally reported in units of daltons (synonymous with atomic mass units ), or the derivative unit kilodalton (kDa). The average size of protein increases from Archaea, Bacteria to Eukaryote (283, 311, 438 residues and 31, 34, 49 kDa respecitvely) due bigger number of protein domains constituting proteins in higher organisms.  For instance, yeast proteins are on average 466 amino acids long and 53 kDa in mass.  The largest known proteins are the titins , a component of the muscle sarcomere , with a molecular mass of almost 3,000 kDa and a total length of almost 27,000 amino acids. 
Blind people have always considered the study of Mathematics as a difficult problem to solve, that strongly hindered the chance to approach scientific studies for generations of visually impaired people. The use of computer is very large among blind students, who appreciate more and more its advantages (speed, efficiency, access to a large quantity of papers, almost unlimited), yet in the field of Mathematics, the benefits are still limited, due to its complex symbols and its bi-dimensional writing.
The LAMBDA-project team designed a system based on the functional integration of a linear mathematical code and an editor for the visualization, the writing and the manipulation of the text.