Biopharma happenings, including deals and partnerships, grants, preclinical data and other news in brief: Acelrx, Assembly, Arrowhead, Astellas, Biotest, Grifols, Medigene, Nektar, Portage, Porton, Sinorda, Stimunity, Tiancheng, Turnstone, Visirna, Wave and Xbiome.