How do I figure out what splicing variant is expressed in certain tissue?

Question

[James]

I'm planning an experiment where I'll be over-expressing a certain gene in stem cell derived neurons (iPSC -> iN). For the over-expression, I would like to know what splicing variant of this gene (if any) is specific to my neurons. I'm having trouble finding a resource to figure this out. Does anyone know where I can find broad information about splicing variants in different tissues, or will I have to look at specific sequencing experiments in literature? Thanks!

[Jeremy Leipzig]

that sounds like a GTEX Portal thing

[James]

That's awesome, thank you!