Table 1.

Neuronal support provided by LIFR^−/− neural cells

LIFR genotype	Numbers of neurofilament positive cells, days in vitro
	20	60
−/−	45  ±  15*	520  ±  65
−/+	420  ±  26	575  ±  38
+/+	467  ±  34	495  ±  51

Monolayers of cells were obtained from E12 forebrain cells and grown for either 20 or 60 days in vitro before being tested for their ability to support the generation of neurons from freshly isolated E14 CBA forebrain cells. Data represent the mean ± SEM of six replicates for each value. 

^*Statistical significance of P < 0.001 using Student’s t test.