| Mb | megabyte; mouse brain; myoglobin | 
|---|---|
| MBLA | methylbenzyl linoleic acid; mouse-specific bone-marrow-derived lymphocyte antigen | 
| MEF | maximal expiratory flow; middle ear fluid; midexpiratory flow; migration enhancement factor; mouse e... | 
| mEGF | mouse epidermal growth factor | 
| MEL | metabolic equivalent level; mouse erythroleukemia |