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Depends on the size of the root and to what extreams. Many times if plants fail you can trim back the roots and reguvinate it so it will grow new roots. Injured roots will usually come back stronger as long as its not from anything other than mishandling or cutting by a shovel. 
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Skeletal muscle - is a peer-reviewed, open access, online journal that publishes articles investigating molecular mechanisms underlying the biology of skeletal muscle.
Cardiac muscle - 
(heart muscle) is involuntary striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium.
Smooth muscle - 
 is an involuntary non-striated muscle. It is divided into two sub-groups; the single-unit (unitary) and multiunit smooth muscle.
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