Do you have reason to suspect that they should become isolated on the same dilution plate

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

Atissue is a group of connected cells that have a similar function within an organism.