为什么Biomart会给ensembl网站提供不同数量的旁白？

这是我用来提取AA792892基因的同源代码：

source("https://bioconductor.org/biocLite.R")
biocLite("biomaRt")

library(biomaRt)

ensembl_mouse <- useMart("ensembl", 
                     dataset = "mmusculus_gene_ensembl")

AA792892_paralogues <- getBM(attributes = c("external_gene_name",
                                  "mmusculus_paralog_associated_gene_name"), 
                     filters = "external_gene_name", 
                     values = "AA792892" , mart = ensembl_mouse) 

View(AA792892_paralogues)

---

也许软件包和网站使用不同的版本？你能给出其他基因的例子吗？尝试更新biomart，你使用的是旧版本

R version 3.4.3 (2017-11-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=English_United Kingdom.1252  LC_CTYPE=English_United 
Kingdom.1252    LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C                           

[5] LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] dplyr_0.7.4    biomaRt_2.34.2

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.15         AnnotationDbi_1.40.0 bindr_0.1            
magrittr_1.5         BiocGenerics_0.24.0  progress_1.1.2       
IRanges_2.12.0      
 [8] bit_1.1-12           R6_2.2.2             rlang_0.1.6          
httr_1.3.1           stringr_1.2.0        blob_1.1.0           tools_3.4.3         

[15] parallel_3.4.3       Biobase_2.38.0       DBI_0.7              
yaml_2.1.16          bit64_0.9-7          digest_0.6.15        
assertthat_0.2.0    
[22] tibble_1.4.2         bindrcpp_0.2         S4Vectors_0.16.0     
bitops_1.0-6         curl_3.1             RCurl_1.95-4.10      glue_1.2.0          

[29] memoise_1.1.0        RSQLite_2.0          stringi_1.1.6        
compiler_3.4.3       pillar_1.1.0         prettyunits_1.0.2    stats4_3.4.3        

[36] XML_3.98-1.9         pkgconfig_2.0.1