Perhaps "self-assemble" would be a better word than "grow" and it wouldn't be limited to just urine and plastic. https://www.frontiersin.org/articles/10.3389/f

Perhaps "self-assemble" would be a better word than "grow" and it wouldn't be limited to just urine and plastic. https://www.frontiersin.org/articles/10.3389/fbioe.2020.00127/full https://www.frontiersin.org/articles/10.3389/fbioe.2020.0012... "Nanoscale Self-Assembly for Therapeutic Delivery" That's just one of many articles on the topic.