Table 2. Measurement of the antiproliferative effect of ATRA and 13cisRA in the absence or presence of R116010 or acitretin in SH-SY5Y cellsa.

Incubation
RA isomer	Inhibitor (1 μM)	Growth inhibition (% untreated cell growth)
	R116010	96.4±2.4
	Acitretin	66.5±1.9
0.01 μM ATRA	—	60.3±2.9
	R116010	48.9±2.2
	Acitretin	52.2±2.3
0.1 μM 13cisRA	—	53.8±2.5
	R116010	42±1.9
	Acitretin	55.7±3.1

^aResults are expressed as mean±s.e.m. from n⩾3 experiments.