Scientists at SUNY Downstate Medical Center have discovered a molecular mechanism that maintains memories in the brain. In an article in Science magazine, they demonstrate that by inhibiting the molecule they can erase long-term memories, much as you might erase a computer disc.
The SUNY Downstate researchers reported in the August 25 issue of Science that an enzyme molecule called "protein kinase M zeta" preserves long-term memories through persistent strengthening of synaptic connections between neurons. By inhibiting the enzyme, scientists were able to erase a memory that had been stored for one day, or even one month. This function in memory storage is specific to protein kinase M zeta, because inhibiting related molecules did not disrupt memory.
(via warrenellis.com - see also even angels have shitty days)