Do some cells not need anything added?

Questions
#1

Hi,

I just finished my first real cell. I looked and looked but could find nothing to add. How often (if ever) does that happen?
#2

Hi plymouthdave,


This happens occasionally, some types of cells have this happen more often than others. For instance, starburst amacrine cells almost never have a cube with nothing to add, while J cells occasionally do.