MannKind could probably serve as the poster child for investor patience. The company is now on its third attempt to gain regulatory approval for its inhalable insulin product, Afrezza. MannKind, though, has a management team that believes in its vision and has forged ahead through trying circumstances. Shareholders who remained patient through the years could finally see their investment pay off later this year when the Food and Drug Administration makes a decision on Afrezza.

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