text: user6782: I am new to this. I have an SNP array composed of digits [0,1,2] for chromosome 21. How do I find the start:end locations for the region that is "21q22.11" step by step?
  
  user681: You first need to get the coordinates of the "cytoband" 21q22.11, which I would search for using the UCSC table browser. You need the following settings: 
  Clade: Mammal
  genome: Human
  assembly: 
  group: Mapping and Sequencing
  track: Chromosome Band
  table: cytoBand
  region: position chr21
  output format: BED
  (you can leave other options as default)
  That will give you a bed file of cytobands on chr21. You'll need to search (e.g. grep) for your cytoband: q22.11.
  
original_text: 6782: <p>I am new to this. I have an SNP array composed of digits [0,1,2] for chromosome 21. How do I find the start:end locations for the region that is "21q22.11" step by step?</p>
   681: <p>You first need to get the coordinates of the "cytoband" 21q22.11, which I would search for using the <a href="https://genome.ucsc.edu/cgi-bin/hgTables?hgsid=791314831_aE2GlksiE79iyiT0FHCRXDZcFwPC" rel="nofollow noreferrer">UCSC table browser</a>. You need the following settings: 
  Clade: Mammal
  genome: Human
  assembly: 
  group: Mapping and Sequencing
  track: Chromosome Band
  table: cytoBand
  region: position chr21
  output format: BED</p>
  
  <p>(you can leave other options as default)</p>
  
  <p>That will give you a bed file of cytobands on chr21. You'll need to search (e.g. grep) for your cytoband: q22.11.</p>
  