hgu133aLOCUSID            package:hgu133a            R Documentation

_M_a_p_p_i_n_g_s _b_e_t_w_e_e_n _p_r_o_b_e _i_d_e_n_t_i_f_i_e_r_s _a_n_d _L_o_c_u_s_L_i_n_k _i_d_e_n_t_i_f_i_e_r_s

_D_e_s_c_r_i_p_t_i_o_n:

     LocusLink identifiers are unique ids used by NCBI <URL:
     http://www.ncbi.nlm.nih.gov/LocusLink/> to represent genetic loci
     and link to curated sequence and descriptive information.
     hgu133aLOCUSID maps probe identifiers to LocusLink identifiers for
     genes represented by the probe identifiers.

_D_e_t_a_i_l_s:

     Mappings of probe ids to LocusLink ids are achieved through the
     linkage between probe ids to manufacturer/user provided ids
     contained in hgu133aACCNUM. LocusLink ids are first mapped to
     manufacturer/user provided ids using file(s) provided by Locuslink
     and in some cases UniGene and other available sources and then
     linked to probe ids based on the mappings between probe ids and
     manufacturer/user provided ids.  

     When a given probe id was mapped to different LocusLink ids by
     different sources, the one agreed by most sources was selected.
     When no agreement was achieved among sources, the one of the
     smallest numeric value was selected. 

     Mappings were based on data provided by:

     LocusLink:<URL:
     ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.gz>. Built:
     January 12, 2005

     Package built: Wed Jan 12 22:21:54 2005

_R_e_f_e_r_e_n_c_e_s:

     <URL: http://www.ncbi.nlm.nih.gov>

_E_x_a_m_p_l_e_s:

         # Convert the environment to a list
         xx <- as.list(hgu133aLOCUSID)
         # Remove probe ids that do not map to any LOCUSID
         xx <- xx[!is.na(xx)]
         if(length(xx) > 0){
             # The LOCUSIDs for the first two elements of XX
             xx[1:2]
             # Get the first one
             xx[[1]]
         }

