Apparent activity (µmol g^–1 of cell protein hour of incubation⁻¹) of enzymes on different available substrates (mmol g⁻¹ of cell protein) in FaO hepatocytes deduced by the fatty acid mass balance.

<p>a: Michaelis-Menten nonlinear regression for Fads2 on 18∶3n-3: <i>Y</i> = 3654 <i>X</i>÷(310+<i>X</i>), <i>R</i>² = 0.93, normality of residual = 0.45; b: linear regression for Elovl5 on 18∶4n-3: <i>Y</i> = 3.479+14.19 <i>X</i>, <i>R</i>² = 0.93, <i>P</i> of deviation from zero <0.05; c: Michaelis-Menten nonlinear regression for Fads1 on 20∶4n-3: <i>Y</i> = 6052<i> X÷</i>(374.6+<i>X</i>), <i>R</i>² = 0.89, normality of residuals <i>P</i> = 0.26; d: Michaelis-Menten nonlinear regression for Elovl2 and Elovl5 on 20∶5n-3: <i>Y</i> = 357.3 <i>X</i>÷(27.5+<i>X</i>), <i>R</i>² = 0.46, normality of residuals <i>P</i> = 0.11; and e: Elovl2, Fads2 and β-oxidation on 22∶5n-3 which is not correlated with the substrate availability. (Note: the <i>Y</i> axis of the e subfigure is different from all the others).