Isotopica: a tool for the calculation and viewing of complex isotopic envelopes. Fernandez-de-Cossio Jorge, Gonzalez Luis Javier, Satomi Yoshinori, Betancourt Lazaro, Ramos Yassel, Huerta Vivian, Amaro Abel, Besada Vladimir, Padron Gabriel, Minamino Naoto, Takao Toshifumi. Nucleic Acids Res. 2004;32:W674–W678. doi: 10.1093/nar/gkh423.
The authors would like to apologize for an error in one of the URLs for the web server, Isotopica. The first URL given in the Abstract should be http://bioinformatica.cigb.edu.cu/isotopica.