The three mRNAs have different molecular weights
{"Image DocumentName": "The three mRNAs have different molecular weights", "Image ImageDescription": "Figure Smooth and striated muscles produce a larger amount of tropomyosin mRNA than do brain cells. This is expected because tropomyosin plays a role in muscle contraction. The three mRNAs have different molecular weights. This indicates that the pre-mRNA is alternatively spliced Copyright \u00a9The McGraw-Hill Companies, Inc. Permission required for reproduction or display.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}