Every day our own cells undergo a very rapid replacement process. While neurons generally persist, about half of their mitochondria turn over in a month;[46] a neurotubule has a half-life of several days;[47] the proteins that add energy to the synapses are replenished every two to five days;[48] the NMDA receptors in synapses are replaced in a matter of hours;[49] and the actin filaments in the dendrites last for about forty seconds.[50] Our brains are thus almost completely replaced within a few months, so in fact you are a biological version of You 2 as compared with yourself a little while
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