|Dataset||MPO Gene-Phenotype Associations|
|Category||disease or phenotype associations|
|Description||underdevelopment or reduced size, usually due to a reduced number of cells, of the largest of the three auditory ossicles, which resembles a club or hammer (Mammalian Phenotype Ontology, MP_0010326)|
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2 gene mutations causing the malleus hypoplasia phenotype in transgenic mice from the MPO Gene-Phenotype Associations dataset.