# What do "is\_injection" and "id" of structure unionizes mean

**URL:** <https://community.brain-map.org/t/what-do-is-injection-and-id-of-structure-unionizes-mean/3139>\
**Category:** General\
**Tags:** how-to\
**Created:** [March 7, 2024, 7:18am UTC](https://community.brain-map.org/t/what-do-is-injection-and-id-of-structure-unionizes-mean/3139 "2024-03-07T07:18:32Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![tylermo](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/tylermo/32/155_2.png) [@tylermo](https://community.brain-map.org/u/tylermo)\
**Post date:** [March 18, 2024, 4:29pm UTC](https://community.brain-map.org/t/what-do-is-injection-and-id-of-structure-unionizes-mean/3139/2 "2024-03-18T16:29:14Z")

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Hi,

The user guide for the mouse connectivity API is here: [API: Allen Brain Connectivity](https://community.brain-map.org/t/api-allen-brain-connectivity/2988/)

Hope that helps,  
Tyler

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