With so many mergers and acquisitions lately, many of life pharmaceutical companies you grew up with many have disappeared, absorbed into other companies or spun out to make their way on their own. Here, the editors of Pharmaceutical technology trace the corporate lineages for the past 30 or so years for pharma's top 15 companies.

View the Pfizer/Wyeth family tree.

View the Abbott family tree.

View the Amgen family tree.

View the AstraZeneca family tree.

View the Bayer family tree.

View the Bristol-Myers Squibb family tree.