Heteroplastic Lens Grafts Related to Factors Inhibiting Lens Regeneration in Triturus

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Abstract
The lenses of young larvae and the presumptive lens-forming ectoderm of early embryos were exchanged between Amblystoma punctatum and Triturus torosus. Also lenses of adult A. punctatum and larval Rana clamitans were implanted in lensectomized eyes of adult Triturus viridescens. The heteroplastic lenses were later excised to study effects on lens regeneration. The results demonstrated that the Amblystoma lens possess the same factors as that of the Triturus for inhibiting lens regeneration from the dorsal iris as long as the graft remained in the Triturus eye. Inhibiting factors were missing in the Rana grafts. Mechanical influences associated with lens size do not appear important since wax spheres replacing lenses in Triturus eyes did not prevent lens regeneration.