This paper is a nice example of Morpholino specificity control by using a Morpholino in its corresponding mutant.
Chambers BE, Gerlach GF, Clark EG, Chen KH, Levesque AE, Leshchiner I, Goessling W, Wingert RA. Tfap2a is a novel gatekeeper of nephron differentiation during kidney development. Development. 2019 Jun 3. pii: dev.172387. doi: 10.1242/dev.172387. [Epub ahead of print]
See especially figure S4: