Herein is disclosed a snowmobile configured to start in response to a remote-start signal. The outer shell has an assembling hole defined therethrough and an oblique guide face annularly defined at the assembling hole. A related system is also provided. Thus, the molding dies are piled up on each other so as to come near to each other and move apart from each other. Also provided are suites of small molecule entities as biomarkers for insulin resistance.