The information provided is insufficient to write a comprehensive gene function summary for MRLN (myoregulin). The PubMed abstracts provided do not contain any studies specifically investigating the MRLN gene or myoregulin protein function. Instead, the abstracts discuss unrelated topics including nasopharyngeal carcinoma radiotherapy (where 'MRLN' refers to medial retropharyngeal lymph nodes), medical imaging techniques, rectal cancer, cholangiocarcinoma staging, classical swine fever virus, and lupus-related skin cancer. Only one abstract 1 mentions myoregulin in the context of sarcoplasmic reticulum calcium regulation in horses with exertional rhabdomyolysis, but provides no functional data about the MRLN gene itself. The study found identical coding sequences between affected and control horses, with no variants associated with the disease phenotype. Based solely on the provided abstracts, it is not possible to describe the primary function, mechanism, disease relevance, or clinical significance of the human MRLN gene, as no relevant functional studies are included in this literature set.