Nanogene Conversion

Each other creature copies the printed values of the targeted creature, except that they aren't legendary. They won't copy other effects that have changed the targeted creature's power, toughness, types, color, or so on. They also won't copy counters on the targeted creature (they'll each just retain the counters they already have).

Non-copy effects that have already applied to the other creatures will continue to apply to them. For example, if Giant Growth had given one of them +3/+3 earlier in the turn, then Nanogene Conversion made it a copy of Bear Cub, it will be a 5/5 Bear Cub.

If the targeted creature is a token, each other creature copies the original characteristics of that token as stated by the effect that created the token. Those creatures don't become tokens.