Amazing developmental biologist🤩
Such a cell contact-tracking system is already taking shape in Drosophila as early as 2016!👍
Dr. Carlos Lois lab @JCellBiol

Monitoring cell-cell contacts in vivo in transgenic animals

https://journals.biologists.com/dev/article/143/21/4073/47656/Monitoring-cell-cell-contacts-in-vivo-in

Is there an even-earlier example!?😆