Get homologous from NCBI homoloGene for a lsit of UniProt protein accession. This workflow is useful if you have a long list of protein accessions. Use PICR to convert UniProt to RefSeq, get homologous from homoloGene and convert RefSeq results to UniProt. Be patient, the workflows has to bring a file around 11Mb. ftp://ftp.ncbi.nlm.nih.gov/pub/HomoloGene/README