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I would add something to Adam's list of reasons why, at least for multicellular euks: even when such elements make it into a germline cell, and even if they are expressed and positively selected, there is still an extremely thin probability that they will ever be "chosen" to become part of the next generation (which is a random process, at least for higher euks). An inserted element at its moment of birth is but one allele in an otherwise large gene pool.

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