[Genome] Known Genes and Refseq genes

[zhangrui]

 Hi,

I found that the known genes set of human contains some noncoding genes, such as microRNAs. For example, "uc001dbx.1	-	65296704	65296779	chr1", which is correspond to "hsa-mir-101-1". 
However, in the website, it is said that the Known Genes track shows known protein coding genes based on proteins from SWISS-PROT, TrEMBL, and TrEMBL-NEW and their corresponding mRNAs from GenBank. Could you tell me the possible reason and how can I get the known protein coding genes in the human genomes?

whether the Refseq genes only contain protein coding genes?

Thanks,
Zhang