Given the following passage  "Early work in molecular genetics suggested the model that one gene makes one protein. This model has been refined since the discovery of genes that can encode multiple proteins by alternative splicing and coding sequences split in short section across the genome whose mRNAs are concatenated by trans-splicing.",  answer the following question. Note that the answer is present within the text.  Question: What is used directly to translated into protein?
A:
mRNAs