Paz Martínez¹ and Antoni Morros²

¹ Instituto de Biología Fundamental. Unidad de Inmunología, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona) Spain.

² Unitat de Biofísica. Departament de Bioquímica i de Biologia Molecular,Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona) Spain

Received 05/06/96; Accepted 06/18/96; On-line 07/01/96

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