1. Flores, R., B. Navarro, S. Gago and M. De la Pena, 2007. Chrysanthemum chlorotic mottle viroid: A system for reverse genetics in the family Avsunviroidae (hammerhead viroids). Plant Viruses, 1: 27-32.
2. De la Pena, M., O.J. Kyrieleis and S. Cusack, 2007. Structural insights into the mechanism and evolution of the vaccinia virus mRNA cap N7 methyl‐transferase. EMBO J., 26: 4913-4925.
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3. Carbonell, A., M. De la Pena, R. Flores and S. Gago, 2006. Effects of the trinucleotide preceding the self-cleavage site on eggplant latent viroid hammerheads: Differences in co- and post-transcriptional self-cleavage may explain the lack of trinucleotide AUC in most natural hammerheads. Nucleic Acids Res., 34: 5613-5622.
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4. Gago, S., M. De la Pena and R. Flores, 2005. A kissing-loop interaction in a hammerhead viroid RNA critical for its in vitro folding and in vivo viability. RNA, 11: 1073-1083.
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5. Flores, R., S. Delgado, M.E. Gas, A. Carbonell, D. Molina, S. Gago and M. De la Pena, 2004. Viroids: The minimal non-coding RNAs with autonomous replication. FEBS Lett., 567: 42-48.
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6. De la Pena, M., S. Gago and R. Flores, 2003. Peripheral regions of natural hammerhead ribozymes greatly increase their self‐cleavage activity. EMBO J., 22: 5561-5570.
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7. Van Meerten, D., H. Groeneveld, D.M. Miller, G.B. Marechal and N.V. Tsareva et al., 2002. In vivo generation of hybrids between different species of RNA phages. J. Gen. Virol., 83: 1223-1235.
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8. De la Pena, M. and R. Flores, 2002. Chrysanthemum chlorotic mottle viroid RNA: Dissection of the pathogenicity determinant and comparative fitness of symptomatic and non-symptomatic variants. J. Mol. Biol., 321: 411-421.
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9. Flores, R., C. Hernandez, M. de la Pena, A. Vera and J.A. Daros, 2001. Hammerhead Ribozyme Structure and Function in Plant RNA Replication. In: Methods in Enzymology, Volume 341: Ribonucleases, Part A: Functional Roles and Mechanisms of Action, Nicholson, A. (Ed.). Chapter 34, Academic Press, New York, USA., ISBN-13: 978-0121822422, pp: 540-552.
10. Elena, S.F., J. Dopazo, M. de la Pena, R. Flores, T.O. Diener and A. Moya, 2001. Phylogenetic analysis of viroid and viroid-like satellite RNAs from plants: A reassessment. J. Mol. Evol., 53: 155-159.
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11. De la Pena, M. and R. Flores, 2001. An extra nucleotide in the consensus catalytic core of a viroid hammerhead ribozyme: implications for the design of more efficient ribozymes. J. Biol. Chem., 276: 34586-34593.
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12. De la Pena, M., S.F. Elena and A. Moya, 2000. Effect of deleterious mutation-accumulation on the fitness of RNA bacteriophage MS2. Evolution, 54: 686-691.
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13. Flores, R., M. De la Pena, J.A. Navarro, S. Ambros and B. Navarro, 1999. Molecular Biology of Viroids. In: Molecular Biology of Plant Viruses, Mandahar, C.L. (Ed.). Chapter 11, Kluwer Academic Publishers, Norwell, MA., USA., ISBN-13: 978-1461373025, pp: 225-239.
14. Flores, R., J.A. Navarro, M. de la Pena, B. Navarro, S. Ambros and A. Vera, 1999. Viroids with hammerhead ribozymes: Some unique structural and functional aspects with respect to other members of the group. Biol. Chem., 380: 849-854.
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15. De la Pena, M., B. Navarro and R. Flores, 1999. Mapping the molecular determinant of pathogenicity in a hammerhead viroid: A tetraloop within the in vivo branched RNA conformation. Proc. Natl. Acad. Sci. USA., 96: 9960-9965.
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