 Internal free fermions in a four-dimensional bosonic string

Keeping the ordinary reparameterization bc ghost system, four embedding bosons require 44 additional real chiral fermions in each chirality to cancel the worldsheet Weyl anomaly. These are internal matter fields, not an assumed locally supersymmetric RNS construction. Their bilinear currents generate the chiral $\mathfrak{so}(44)$ current algebra, with $\left(\genfrac{}{}{0ex}{}{44}{2}\right)=946$ currents. A full closed fermionic model also requires consistent spin-structure and modular projections; the central-charge count alone does not determine these choices.