caption: the protein transition of a proteins rna
exif: {"Image DocumentName": "The 3 end of the pre-mRNA molecule is also modified before the mRNA exits the nucleus.", "Image ImageDescription": "An enzyme adds 50\u2013250 more adenine (A) nucleotides, forming a poly-A tail..", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}