# Mouse\_connectivity\_cache difference between structures in experiment dataframe

**URL:** <https://community.brain-map.org/t/mouse-connectivity-cache-difference-between-structures-in-experiment-dataframe/629>\
**Category:** Technical\
**Tags:** software, experiment-design, atlas-mouse-brain-connectivity, analysis, allensdk\
**Created:** [July 9, 2020, 3:40pm UTC](https://community.brain-map.org/t/mouse-connectivity-cache-difference-between-structures-in-experiment-dataframe/629 "2020-07-09T15:40:52Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![lemphi97](https://avatars.discourse-cdn.com/v4/letter/l/74df32/32.png) [@lemphi97](https://community.brain-map.org/u/lemphi97)\
**Post date:** [July 9, 2020, 3:40pm UTC](https://community.brain-map.org/t/mouse-connectivity-cache-difference-between-structures-in-experiment-dataframe/629/1 "2020-07-09T15:40:52Z")

</div>

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  
 ![image](https://canada1.discourse-cdn.com/flex027/uploads/brainobservatory/original/1X/6988b91adb5c6b7e5adf2de3f1823b6855417884.png)

---

_[View the full topic](https://community.brain-map.org/t/mouse-connectivity-cache-difference-between-structures-in-experiment-dataframe/629)._