  Non-perturbative electroweak effects, in thermal equilibrium in the early
universe, have the potential to erase the baryon asymmetry of the universe,
unless it is encoded in a B-L asymmetry, or in some "accidentally" conserved
quantity. We first consider the possibility that the BAU may be regenerated
from lepton flavour asymmetries even when initially $B-L = 0$. We show that
provided some, but {\it not} all the lepton flavours are violated by
${\Delta}L{\neq}0$ interactions in equilibrium, the BAU may be regenerated
without lepton mass effects. We next examine the possibility of encoding the
baryon asymmetry in a primordial asymmetry for the right-handed electron, which
due to its weak Yukawa interaction only comes into chemical equilibrium as the
sphalerons are falling out of equilibrium. This would also raise the
possibility of preserving an initial baryon asymmetry when $B-L = 0$.
