Why did protistants take out Biblical books?

[Mathurin]

A few facts for the discussion.  The books in question(deuterocanononicals) were accepted by the Jews as part of the OT at the time of Christ.  Christ quoted from them several times, and so did the apostles.  He never once said anything negative about  them.  Jerome later in his life declared that he was incorrect to have doubted their authenticity and inspiration in his younger years.