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Bill Gates has dabbled in biomedicine for more than a decade. His stakes in biotech companies now top $300 million. Meanwhile his foundation has spent $3.1 billion on global health matters -- about 52% of its total grants. Here's how the investments line up:Personal Biotech Holdings
CORIXA drugs for cancer and infectious diseases
GENECRAFT drugs for cancer and inflammation
ICOS erectile dysfunction drug
PAIN THERAPEUTICS painkillers
SEATTLE GENETICS cancer therapiesThe Bill & Melinda Gates Foundation
$750 MILLION for childhood immunizations in developing countries
$100 MILLION research grant to the International AIDS Vaccine Initiative
$70 MILLION to fight epidemic meningitis in sub-Saharan Africa
$28 MILLION to fight schistosomiasis, a parasitic disease