Amarantus Bioscience Holdings Inc. a biotechnology company focused on developing products for Regenerative Medicine, Neurology and Orphan Diseases, announced that it has requested Rare Pediatric Disease Designation (RPDD) from the US Food and Drug Administration (FDA) for treating retinitis pigmentosa (RP) with MANF(mesencephalic-astrocyte-derived neurotrophic factor). MANF was previously granted orphan drug designation (ODD) by the US FDA in December 2014.