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Chromosomes from Walvax-2 cell banks. Walvax-2 cells were incubated 1 day post-subculture, after which the colcemid and then Giemsa banded karyotype analyses were carried out. Pictures were the karyotype of Walvax-2 cells at the 6th (A), 14th (B), 20th (C) and 38th (D) passages
