Table 1.

Animals, fields, and cell numbers imaged in vivo

Layer	Age	Animals	Fields	Mean depth	# Cells
L2/3	P9–11	4	12	186 ± 7.4 μm	508
	P12–14	7	12	188 ± 6.4 μm	699
	P15–16	4	10	189 ± 4.8 μm	1301
	P18–20	9	22	190 ± 3.4 μm	2210
	P28–59	8	15	189 ± 4.1 μm	989
L4	P9–11	3	6	348 ± 29.3 μm	217
	P12–14	6	7	345 ± 18.8 μm	497
	P15–16	4	13	347 ± 7.7 μm	1039
	P18–20	8	21	348 ± 14.6 μm	1264
	P28–59	9	14	370 ± 10.9 μm	846