Abstract
It is shown that the combined action of spin–flavour conversions
of supernova neutrinos due to the interactions of their Majorana-type
transition magnetic moments with the supernova magnetic fields and
flavour conversions due to the mass mixing can lead to the
transformation of νe born in the neutronization process into
their antiparticles 
e. Such an effect would have a clear
experimental signature and its observation would be a `smoking gun' evidence
for the neutrino transition magnetic moments. It would also signify a value of the
leptonic mixing parameter |Ue3| in excess of 10−2.
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