Are messenger particles (bosons) each one  string in superstring theory?

Is everything in Standard Model elementary particles, for example bosons, fermions and Higgs boson?

Is the answer not here?:

On 8/22/2022 at 9:40 PM, MigL said:

In Superstring theory, all fundamental fermions  ( particles ) and bosons ( forces ) are the result of differing vibrational frequencies of even more fundamental, Planck scale, supersymmetric 'strings'.

A composite particle, such as a neutron, would be the result of the vibrational interactions of the constituent quark/gluon strings.