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Kingsley-Kallesen M, Johnson L, Scholtz B, Kelly D, Rizzino A.Kingsley-Kallesen M, et al. Among authors: rizzino a.In Vitro Cell Dev Biol Anim. 1997 Apr;33(4):294-301. doi: 10.1007/s11626-997-0050-1.In Vitro Cell Dev Biol Anim. 1997.PMID: 9156346