3JSB:
reference: The N-terminal domain of the arenavirus L protein is an RNA endonuclease essential in mRNA transcription., Morin B, Coutard B, Lelke M, Ferron F, Kerber R, Jamal S, Frangeul A, Baronti C, Charrel R, de Lamballerie X, Vonrhein C, Lescar J, Bricogne G, Gunther S, Canard B, PLoS Pathog. 2010 Sep 16;6(9). pii: e1001038. PMID: 20862324

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