What does mastocytosis mean?

What does mastocytosis mean?
A spoken definition of mastocytosis.

Intro Sound:
Typewriter - Tamskp
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Outro Music:
Groove Groove - Kevin MacLeod (incompetech.com)
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Intro/Outro Photo:
The best days are not planned - Marcus Hansson
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Book Image:
Open Book template PSD - DougitDesign
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Text derived from:
http://en.wiktionary.org/wiki/mastocytosis

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