  The properties of particle production in pp collisions are basis for analysis
of pA and AA interactions and verification of theory. We analyzed inclusive
particle production using z-scaling established in proton-proton and
proton-antiproton collisions at the U70, ISR, Tevatron and RHIC. This scaling
reflects symmetry of hadron structure, interaction and particle formation. It
is shown that new data on charged hadron and pi0-meson spectra obtained in pp
collisions at the Relativistic Heavy Ion Collider confirm the z-scaling.
