The invention reflates to a method for preparing an antibody-producing cell line capable of directed constitutive hypermutation of a specific nucleic acid region, comprising the steps of: a) screening a clonal cell population for V gene diversity: b) isolating one or more cells which display V gene diversity and comparing the rate of accumulation of mutations in the V genes and other genes of the selected cells; and c) selecting a cell in which the rate of V gene mutation exceeds that of other gene mutation.
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