Flashing Sequence (video) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Loading video... Caption As "letters," or bases, are added to RNAs throughout the cell during fluorescent in situ sequencing, the RNAs flash a specific color that indicates which base has been added (0:00-0:05 of this video). The sequence of colors, represented abstractly here as a growing stack of colored balls (0:08-0:16), reveals the base sequence. Credit Wyss Institute and Harvard Medical School Usage Restrictions Please, credit Wyss Institute and Harvard Medical School. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.