Berry-Kravis, E. M., Harnett, M. D., Reines, S. A., Reese, M. A., Ethridge, L. E., Outterson, A. H., . . . Gurney, M. E.  (2021). Inhibition of phosphodiesterase-4D in adults with fragile X syndrome: a randomized, placebo-controlled, phase 2 clinical trial. Nature Medicine, 27(5), 862–870 . https://doi.org/10.1038/s41591-021-01321-w