  The evolution of properties and interactions of elementary particles is
described, beginning with the Planck scale of $10^{19}$ GeV. The description is
based on the hypothesis that high-temperature (high-energy) limit of the
Standard Model is generated by the gauge group contraction. In the
infinite-temperature limit, properties of particles fundamentally change: all
particles lose their masses, only massless neutral $Z$ bosons and $u$ quarks
together with neutrinos and photons survive. Weak interactions become
long-range ones and are generated by neutral currents. Quarks have only one
color degree of freedom.
