Meanings of partial reversion in English

This is an interesting example of partial reversion in the same individual plant as it grows older.

However, response to repeated intravenous immunoglobuline (IVIG) therapy during pregnancy and shortly after childbirth resulted in partial reversion of foot drop.

But many of the deformed types, being the result of a partial reversion to the pedestrian nature, were able to live on indefinitely without flight.