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artículo
Publicado 1998
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We greatly acknowledge BSc Rosario Tapia for thetechnical assistance with the animals. This work wassupported in part by the Consejo Nacional de Ciencia yTecnologia (CONCYTEC) Lima, Perú, the InstitutFranc ̧ais d’Etudes Andines (IFEA), Lima and the San-doz Laboratories, Rueil, France.