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Elimination of egg pigment from developing ocular tissues in the frog Rana pipiens☆
[摘要] Themethodbywhicheggpigmentiseliminatedfromthedevelopingretina,cornealepitheliumandlensinRanapipienswasstudiedwithlightandelectronmicroscopy.Theretinaexpellseggpigmentintothespacebetweentheretinaandpigmentepithelium.Thispigmentisthenengulfedbythepigmentepithelialcells.Thecornealepitheliumeliminateseggpigmentdirectlytotheoutsideviathefreesurfaceoftheepithelialcells.Eggpigmentaccumulatesinafewcellsinthelens.Thesecellsprobablydegenerateandareextruded.Theseectodermalderivativesintheeyearefreeofeggpigmentlongbeforeectodermalderivativesinotherpartsoftheembryolosetheirpigment.Theearlyeliminationofeggpigmentfromoculartissuesmayrelatedtothefactthatthesetissuesmustbetransparentinorderthatlightmaypassfreelytothephotoreceptors.
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[效力级别]  [学科分类] 生物科学(综合)
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