Hi,

I am importing microarray data, and after normalization with gcrma I get
the following warnings:

<Quote/>
Warning messages:
1: replacing previous import by ‘utils::head’ when loading ‘mouse4302cdf’
2: replacing previous import by ‘utils::tail’ when loading ‘mouse4302cdf’
</Quote>

Should I be concerned, and if so, can something be done to prevent this?
I am on Mavericks (Mac OSX), on a Macbook Pro from early 2011. Further info
about the session:

> sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: x86_64-apple-darwin10.8.0 (64-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

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

other attached packages:
 [1] mouse4302probe_2.14.0 AnnotationDbi_1.26.0  GenomeInfoDb_1.0.2
 [4] mouse4302cdf_2.14.0   inSilicoMerging_1.8.0 inSilicoDb_2.0.1
 [7] RCurl_1.95-4.1        bitops_1.0-6          rjson_0.2.13
[10] DWD_0.11              Matrix_1.1-3          gcrma_2.36.0
[13] affy_1.42.0           limma_3.20.1          Biobase_2.24.0
[16] BiocGenerics_0.10.0

loaded via a namespace (and not attached):
 [1] affyio_1.32.0         BiocInstaller_1.14.1  Biostrings_2.32.0
 [4] DBI_0.2-7             grid_3.1.0            IRanges_1.22.3
 [7] lattice_0.20-29       preprocessCore_1.26.0 RSQLite_0.11.4
[10] splines_3.1.0         stats4_3.1.0          tools_3.1.0
[13] XVector_0.4.0         zlibbioc_1.10.0

Thanks and kind regards,
Bas

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