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Eukaryotes may regulate gene expression at any number of levels.

Imagine that transcripts of gene A are found only in the developing liver and transcripts of gene B are found only in the developing eye. List a general type of cis-regulatory sequence difference that could explain the expression difference between the two genes.

b) List one possible mechanism by which a gene may give rise to differently sized mature mRNAs in different tissues.
c) List 2 ways in which gene expression may be regulated after a mature transcript is produced ( after addition of a 5' cap and poly (A) tail and removal of introns).