Mouse_connectivity_cache difference between structures in experiment dataframe

I would like to know what is the difference between structure_id and primary_injection_structure for an experiment. Most of the time, they are the same, but sometime they do differ.

Here’s an example for the experiment 527712447

In short, I don’t get what primary_injection imply. If someone could clarify.

Hello. Since these injections are not so precise that they can target only a single structure, we report which structure got the majority of the injection, as well as any other structures that also received some of the injection.

From the “Injection Site Polygon Drawing and Informatics Processing” section of the project overview document available here :
“The structure receiving the largest proportion of signal intensity was distinguished as the primary structure, and all other structures were considered secondary structures. A quantified injection summary is provided for each image series that shows the relative amounts of signal detected within each
infected structure.”

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