Hello. Im trying to learn more about different extensions of the standard model. Are the Left Right Symmetric Extension of the Standard model and the Neutrino Minimal Standard Model different extensions? I know both add 3 right handed neutrinos. Do these neutrinos differ in any way, also are there other differences between the models. I know the LR symmetric extension is based on the gauge group SU(2)l x SU(2)r x U(1) b-l. Is the vMSM based on a gauge group and if so which one?