Transcription and RNA Processing

ID #2401

In reference alternative splicing, Mr. Mehrtens said that different mature mRNA leads to different proteins. What exactly is meant by "mature mRNA?" What's the difference between mature and ..immature mRNA?

Mature mRNA would be mRNA that is ready to be translated by a ribosome. This means that it has received the methylguanosine cap, any introns have been spliced out, and it has a poly-A tail. 
An immature mRNA would be one that is still being transcribed or processed. 

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