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Messenger RNA has been isolated from rat lens tissue. The mRNA species which codes for the A2 chain of alpha-crystallin, revealed the same extremely high sedimentation value (14S) as the corresponding messenger from calf lens. However, it has been shown that in rat lens the 14-S messenger preparation directs the synthesis of an additional alpha-crystallin chain, designated as alpha-X with an approximate molecular weight of 24000. For comparative purpose crystallin synthesis has also been studied as well in cultured rat lens cells as in the rat lens cell-free system.
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Cohen et al. (1976) studied this question.
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