Here is a discussion of protein interactions and other cellular changes caused by phosphorothioate oligos that are not seen with Morpholinos.
Flynn LL, Li R, Aung-Htut MT, Pitout IL, Cooper J, Hubbard A, Griffiths L, Bond C, Wilton SD, Fox AH, Fletcher S. Interaction of modified oligonucleotides with nuclear proteins, formation of novel nuclear structures and sequence-independent effects on RNA processing. bioRxiv. 2018:446773[Preprint] doi:10.1101/446773
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