,Supporting cell density (cells/mm2),,,,,,,,, ,Periphery,,,,,,Center,,, Stage,utr1,utr2,utr3,utr4,utr5,,utr1,utr2,utr3,utr4 E18.5,38392.01,32172.11,38812.52,35411.52,36705.88,,50867.54,49277,47103.01,39101.53 P2,42797.58,46607.92,51011.47,48577.89,51228.52,,44042.86,47482.75,46952.37,41663.75