Beth Seidenberg and Sean Harper, Westlake Village

Sean Harp­er and Beth Sei­den­berg add $500M to their new VC, bet­ting on the LA biotech ecosys­tem

When Ar­se­nal Bio launched last year, the head­line name was Nap­ster bil­lion­aire Sean Park­er, who, af­ter fund­ing an im­munother­a­py in­sti­tute, de­cid­ed to back a …

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