  We argue that recently reported high resolution angle-resolved photoelectron
spectra from cuprates, where an anomalous high-energy dispersion was
identified, reveal the internal structure of the hole quasiparticle in quantum
antiferromagnets and more importantly it is evidence for the existence of
``string-excitations'' which validate early predictions based on the $t-J$
model. Their energy-momentum despersion as well as the manner in which the
spectral weight is transfered to higher energy string excitations as well as
the vanishing of the quasiparticle spectral weight near the $\Gamma$ point, are
all in agreement with predictions without adjusting any parameters.
