Before revision:  In addition, we also study this phenomenon in the context of active fluid , which justifies  our assumptions in the computational model. We show that no finger protrusions could emerge in a  homogenous active fluid .
After revision:  In addition, we also study this phenomenon in the context of active fluid , which justifies our assumptions in the computational approach. In particular, we show that in our model no finger protrusions could emerge in a homogenous active fluid .