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MR

Magnetic resonance – as in magnetic resonance imaging or MRI

MRA

Magnetic Resonance Angiography.  A magnetic resonance image of blood vessels which, unlike routing angiography, is noninvasive.

MRI

Magnetic resonance imaging. A sophisticated imaging technique using magnetic fields instead of x-rays to create the image.

mRNA

Messenger RNA – a type of RNA that passes genetic information from the DNA to the ribosome that directs protein synthesis.

MRP

Magnetic Resonance Perfusion.  Magnetic Resonance Imaging  technique for evaluating perfusion or the degree of delivery of oxygen and nutrients by blood circulation to a tissue.

MRS

Magnetic resonance spectroscopy – specialized magnetic resonance imaging used to characterize and quantitative relative concentrations of brain metabolites. This information can be used in determining the tissue type in an area of interest on a routine magnetic resonance image.

MRS

Magnetic resonance spectroscopy – This refers to using the MR scanner to perform a NMR analysis of the tissue being imaged ignorer to gain information about its molecular makeup.

MRSA

Methicillin resistant Staphylococcus aureus – a strain of bacteria that has developed a resistance to a commonly used penicillin antibiotic, methicillin.

MSA

Muscle smooth actin – refers to a stain for muscle actin occurring in skeletal, cardiac and other smooth muscles. It does not stain non-muscle actin. It is used to differentiate tumors containing muscle elements from those that do not.

MSX2

A gene responsible for coding for the synthesis of the Homeobox protein MSX-2. This protein regulates apoptosis of neural crest cells occurring during the morphogenesis of the skull and face.