A nonsense mutation in the leptin gene that results in a stop codon and lack of leptin production was first observed in mice in 1950. In the mouse gene, arginine-105 is encoded by CGA and only requires one nucleotide change to create the stop codon TGA.
The fuel pump relay, located deep inside the TIPM, is the most common relay to fail since it's powered on 100% of the time while you're driving. You likely found this website because your dealer wants to change your fuel pump ($600+) or TIPM ($1000+).
MAC Address Pool on CISCO Switches. I have read in the CCNP Book STP Topic that a Catalyst Switch may have a pool of either 64 or 1024 MAC Address. Since there was just a single paragraph stating this feature and no further deail, I searched the net to get this thing clear. MAC Address on a VLAN (SVI) or L3 Interface on Catalyst Switches.