随着胶原层变厚，原来的胶原钙和关节软骨细胞退化。
As the collagen layer thickens, older collagen calcifies and older chondrocytes deteriorate.
没有受精的中央细胞退化时最显著的特点是细胞核产生核膜囊泡。
The most prominent sign of degeneration is that the central cell nucleus produced nuclear vacuoles.
视网膜炎色斑是一种可以引起视力丧失的疾病，也就是图像受体细胞退化，最终丧失功能。
Retinitis pigmentosa is a disease that causes progressive loss of vision, as the photoreceptor cells degenerate, and eventually die.
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