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Molecular structures, however, can be represented as 2D maps of interactions between the individual residues, which are easier to visualize and compare, and which can be reconverted to 3D structures with reasonable precision. There are many visualization tools for maps of protein structures, but few for nucleic acids.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>We developed RNAmap2D, a platform-independent software tool for calculation, visualization and analysis of contact and distance maps for nucleic acid molecules and their complexes with proteins or ligands. The program addresses the problem of paucity of bioinformatics tools dedicated to analyzing RNA 2D maps, given the growing number of experimentally solved RNA structures in the Protein Data Bank (PDB) repository, as well as the growing number of tools for RNA 2D and 3D structure prediction. RNAmap2D allows for calculation and analysis of contacts and distances between various classes of atoms in nucleic acid, protein, and small ligand molecules. It also discriminates between different types of base pairing and stacking.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>RNAmap2D is an easy to use method to visualize, analyze and compare structures of nucleic acid molecules and their complexes with other molecules, such as proteins or ligands and metal ions. Its special features make it a very useful tool for analysis of tertiary structures of RNAs. RNAmap2D for Windows\/Linux\/MacOSX is freely available for academic users at <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/iimcb.genesilico.pl\/rnamap2d.html\" ext-link-type=\"uri\">http:\/\/iimcb.genesilico.pl\/rnamap2d.html<\/jats:ext-link>\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2105-13-333","type":"journal-article","created":{"date-parts":[[2012,12,22]],"date-time":"2012-12-22T03:00:48Z","timestamp":1356145248000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["RNAmap2D \u2013 calculation, visualization and analysis of contact and distance maps for RNA and protein-RNA complex structures"],"prefix":"10.1186","volume":"13","author":[{"given":"Michal J","family":"Pietal","sequence":"first","affiliation":[]},{"given":"Natalia","family":"Szostak","sequence":"additional","affiliation":[]},{"given":"Kristian M","family":"Rother","sequence":"additional","affiliation":[]},{"given":"Janusz M","family":"Bujnicki","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2012,12,21]]},"reference":[{"issue":"31","key":"5623_CR1","doi-asserted-by":"publisher","first-page":"7133","DOI":"10.1021\/bi00483a001","volume":"29","author":"KA Dill","year":"1990","unstructured":"Dill KA: Dominant forces in protein folding. 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