Thanks for the response! Interesting review article.

It does seem like a lot of these studies focus on either in-depth engineering of the bacteria (Like Tal Danino's lab) or lots of post-growth chemical/physical modification. It seems like there might be an opportunity to combine those approaches.

What are the important characteristics of the bacterial component to make this system work? Anything beyond motility and engineerability?

Is the surface display of biotin attachment peptides limited? Do you think you could see significant gains by using other bacteria, like clinically derived probiotics that are better adapted for nonpathogenic colonization? I'm thinking Lactobacillus here.