Regeneron says it can now roll out a lot more bispecific antibody-based therapies including a new class of costimulatory bispecifics. Regeneron just rejigged its Praluent and Kevzara co-marketing deal with Sanofi. The “simplified” accord was covered at the JP Morgan healthcare conference last week. However, Regeneron devoted much more of its presentation to bispecific antibodies. CEO Len Schleifer told delegates progress made by two bispecific drug candidates – REGN1979 and REGN5458 – were indicative of the utility of its VelocImmune and…