  We show that fermion charge fractionalization can take place in a recently
proposed chiral gauge model for graphene even in the absence of Kekul\'e
distortion of the graphene honeycomb lattice. We extend the model by adding the
coupling of fermions to an external magnetic field and show that the fermion
charge can be fractionalized by means of only gauge potentials. It is shown
that the chiral fermion charge can also have fractional value. We also relate
the fractionalization of the fermion charge to the parity anomaly in an
extended Quantum Electrodynamics which involves vector and vector-axial gauge
fields.
