PLMItRNA, a database on the heterogeneous genetic origin of mitochondrial tRNA genes and tRNAs in photosynthetic eukaryotes. - Guglielmo Rainaldi; Mariateresa Volpicella; Flavio Licciulli; Sabino Liuni; Raffaele Gallerani; Luigi R. Ceci (Nucleic Acids Res., 2003)