octadecanoyl-CoA + L-serine + H(+) => 3-oxoeicosasphinganine + CO2 + CoA
octadecanoyl-coa + l-serine + h(+) => 3-oxoeicosasphinganine + co2 + coa
octadecanoyl-CoA + L-serine + H(+) => 3-oxoeicosasphinganine + CO2 + CoA
octadecanoyl-coa + l-serine + h(+) => 3-oxoeicosasphinganine + co2 + coa