The development and aging of the chicken cornea is accompanied by the stepwise disappearance of the non-sulphated glucosaminoglycan and by the increase of keratan sulphate and chondroitin sulphate content. After hatching, keratan sulphate becomes a predominant part of corneal glycosaminoglycans. Radioactive sulphate incorporates into both sulphated polysaccharides at a similar rate which appears to diminish with the aging of the cornea
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Praus et al. (2009) studied this question.