fig1

Figure 1. Discovery of the RSKs. Timeline depicting the key milestones in the discovery of the RSKs, including the discovery of Ribosomal S6 Kinase (S6K), Ribosomal S6 Kinase (RSKs), RPS6KA1 (RSK1), RPS6KA3 (RSK2), RPS6KA2 (RSK3), RPS6KA5 (MSK1), RPS6KA4 (MSK2) and RPS6KA6 (RSK4).