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Interspecific backcross analysis using progeny derived from matings of ( C57BL / 6J x Mus spretus ) F1 x C57BL / 6J mice indicates that the thrombospondin gene is tightly linked to the Fshb , Actcl , Ltk , and B2M loci on murine chromosome 2 .
 GENE: thrombospondin gene; GENE: Fshb; GENE: Actcl; GENE: Ltk; GENE: B2M loci
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: thrombospondin gene; GENE: Fshb; GENE: Actcl; GENE: Ltk; GENE: B2M loci