Do not be misled by the unsubstantiated claims of other suppliers!
For Reliable, Robust Retrograde Transport, There’s Only One Choice: RetroBeads™ from Lumafluor.
No matter what they call their products, only Retrobeads™ (regular and IX) from Lumafluor have been proven effective by hundreds of published papers in systems ranging from invertebrates to primates, and everything in between.
Highly confined injections–superb for detailed connectivity studies. Persist indefinitely (> 1 year!) in living cells, nontoxic. Compatible with most other anterograde tracers, in situ hybridization, and immunohistochemsitry.