Table 2. Steady-state values of PM ergosterol, total ergosterol, total ergosterol-esters, total sterols, and total steryl-esters in the SL-E model under different experimental conditions, after 60 minutes.

	PM Ergosterol	Total Ergosterol	Total Erg. Esters	Total Sterols	Total Steryl Esters
	X 36,X 37, X 39	X 32, X 36, X 37, X 39	X 35, X 40	X 30, X 31, X 32, X 36, X 37, X 39	X 33, X 34, X 35, X 40
Wild Type (% total sterols)	95.1	104.61	45.7	112.91	62.2
1% SPT	0.96	0.97	1.05	0.98	1.05
1% SPT (120 min)	0.89	0.92	1.11	0.94	1.12
1% IPC synthase	0.94	0.95	1.02	0.95	1.01
12.5% Ceramide synthase	1.00	1.00	1.01	1.00	1.01

Wild type condition is represented by the sum of the basal values; the other experimental conditions correspond to fold changes with respect to the wild type after decreasing the specific activity of serine palmitoyl transferase (X ₁₅₇), IPC synthase (X ₁₃₃), and ceramide synthase (X ₁₃₄) to 1% or 12.5%.