This is an interesting technique for later-stage zebrafish embryo treatment, involving pulsed injection of a mixture of Morpholino and Endo-Porter into the heart. I think this might push the limit of solubility for many Morpholino sequences. They are reporting good systemic delivery -- see the video for fluorescent images of the oligo distribution.
Konantz J, Antos CL. Reverse Genetic Morpholino Approach Using Cardiac Ventricular Injection to Transfect Multiple Difficult-to-target Tissues in the Zebrafish Larva. J Vis Exp. 2014;88:e51595 doi:10.3791/51595
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