Hi!
I would like to share a quite interesting paper on microfluidics. A gel shell was made to encapsulate the cell in drop, with conditionable permeability.
Though the paper use bacterium, it could be transferred to animal cells as well. Either culture or single-cell assay can be done within the lumen of each drop. For colleagues interested please see the paper https://pubs.rsc.org/en/content/articlelanding/2020/lc/d0lc00660b