We argue that simpler fermionic contents, responsible for the extension ofthe standard model with gauged lepton and baryon charges, can be constructed byassuming existence of so-called leptoquarks (j,k) with exotic electric chargesq_j=1/2, q_k=-1/2. Some new features in our model are that (i) as the naturalconsequences of anomaly cancelation the right-handed neutrinos exist, and thenumber of the observed fermion families is equal to the number of thefundamental colors; (ii) although the lepton and baryon charges are conserved,the neutrinos can obtain small masses through the type I seesaw mechanism insimilarity to the standard context, and the baryogenesis can be generated inseveral cases. They all are natural results due to the spontaneous breaking ofthese charges. Some constraints on the new physics via flavor changing andrelated phenomenologies such as the stable scalar with anomalous electriccharge and interested processes at colliders are also discussed.
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