hgu133aMAP              package:hgu133a              R Documentation

_A_n_n_o_t_a_t_i_o_n _o_f _p_r_o_b_e _i_d_e_n_t_i_f_i_e_r_s _b_y _c_y_t_o_b_a_n_d_s

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

     hgu133aMAP mappes probe ids to cytobands, which are the positions
     of cytogenetic bands within chromosomes

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

     This is an environment object with key and value pairs. Keys are
     probe ids and values are cytobands on chromosomes. Values are
     vectors of length 1 or greater depending on whether genes
     represented by probe ids can be mapped to only one or more
     chromosomes. NAs are assigned to probe ids that can not be mapped
     to any cytoband at this time.

     The physical location of each band on a chromosome can be obtained
     from another environment named "organism"CYTOLOC in a separate
     data package for human(humanCHRLOC), mouse(mouseCHRLOC), and
     rat(ratCHRLOC).  

     Mappings were based on data provided by:

     LocusLink built: March  3, 2004. <URL:
     ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.ga>

     Package built Wed Mar  3 16:27:29 2004

_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(hgu133aMAP)
         # Remove probe ids that do not map to any cytoband
         xx <- xx[!is.na(xx)]
         if(length(xx) > 0){
             # The cytobands for the first two elements of XX
             xx[1:2]
             # Get the first one
             xx[[1]]
         }

