  We present a summary of possible signals of the chiral symmetry restoration
and deconfinement phase transitions which may be, respectively, probed at the
center of mass collision energies at 4.3-4.9 GeV and above 8.7-9.2 GeV. It is
argued that these signals may evidence for an existence of the tricritical
endpoint of QCD phase diagram at the collision energy around 8.7-9.2 GeV. The
equation of state of hadronic matter with the restored chiral symmetry is
discussed and the number of bosonic and fermionic degrees of freedom is found.
