The Voyager episode The Gift is, for all intents and purposes, the story of how Seven became human. Multiple times in the first 10-15 minutes the Doctor comments on how aggressively her human half is reasserting itself, rejecting the implants and causing medical issues.
But Why did Seven's organic components re-surge the way they did once her link to the Collective was severed? In the Next Generation episode I Borg, the Borg Hugh did not appear to suffer from any implant rejection.
Was Seven an aberration, fitted with sub-par implants or blessed with a particularly strong constitution? Or was Hugh abnormal in someway, able to go long periods of time without any implant rejection?