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M in MARFAN

U R menimic is awesome , let me add a few other features form M :)

M can be for Increase Methionine
Mcan be for Microfibrilin protein (ECM) protein which is aka Fibrillin
 

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In the new Harrison downward dislocation of Lens is mentioned...
Our path professors really stressed this as a diagnostic characteristic:
Marfan's Up and Out dislocation vs. Homocysteinuria Down and In dislocation

however this is just a generalization, you will find in many sources that different dislocations are possible because they do exist (such as the one mentioned in harrison's)
 

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other differences

MARFAN'S:

Mitral valve prolapse
Aortic Aneurysm
Retinal detachment
Fibrillin
Arachnodactyly
Negative Nitroprusside test (differentiates from homocystinuria)
Subluxated lens(Upward dislocation of Lens)
homocystinosis_ has mental retardation,lower n nasal subluxation of lens also which differentiate it from marfans syndrome
 
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