Biotech stocks with share prices under $5 are generally too dangerous to own. Even so, some of these dirt-cheap biotechs can, on rare occasion, represent compelling growth opportunities for risk-tolerant investors. With this in mind, here’s a look at why you may want to buy Amarin Corp. (NASDAQ: AMRN) and Geron Corp. (NASDAQ: GERN), but avoid MannKind Corp. (NASDAQ: MNKD) right now.
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