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diff --git a/src/jalview/ext/ensembl/EnsemblSequenceFetcher.java b/src/jalview/ext/ensembl/EnsemblSequenceFetcher.java
new file mode 100644
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+++ b/src/jalview/ext/ensembl/EnsemblSequenceFetcher.java
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+package jalview.ext.ensembl;
+
+import jalview.datamodel.DBRefSource;
+import jalview.ws.seqfetcher.DbSourceProxyImpl;
+
+import com.stevesoft.pat.Regex;
+
+/**
+ * A base class for Ensembl sequence fetchers
+ * 
+ * @author gmcarstairs
+ */
+abstract class EnsemblSequenceFetcher extends DbSourceProxyImpl
+{
+  /*
+   * accepts ENSG/T/E/P with 11 digits
+   * or ENSMUSP or similar for other species
+   * or CCDSnnnnn.nn with at least 3 digits
+   */
+  private static final Regex ACCESSION_REGEX = new Regex(
+          "(ENS([A-Z]{3}|)[GTEP]{1}[0-9]{11}$)" + "|" + "(CCDS[0-9.]{3,}$)");
+
+  /*
+   * possible values for the 'feature' parameter of the /overlap REST service
+   * @see http://rest.ensembl.org/documentation/info/overlap_id
+   */
+  protected enum EnsemblFeatureType
+  {
+    gene, transcript, cds, exon, repeat, simple, misc, variation,
+    somatic_variation, structural_variation, somatic_structural_variation,
+    constrained, regulatory
+  }
+
+  @Override
+  public String getDbSource()
+  {
+    // NB ensure Uniprot xrefs are canonicalised from "Ensembl" to "ENSEMBL"
+    return DBRefSource.ENSEMBL; // "ENSEMBL"
+  }
+
+  @Override
+  public String getDbVersion()
+  {
+    return "0";
+  }
+
+  @Override
+  public String getAccessionSeparator()
+  {
+    return " ";
+  }
+
+  /**
+   * Ensembl accession are ENST + 11 digits for human transcript, ENSG for human
+   * gene. Other species insert 3 letters e.g. ENSMUST..., ENSMUSG...
+   * 
+   * @see http://www.ensembl.org/Help/View?id=151
+   */
+  @Override
+  public Regex getAccessionValidator()
+  {
+    return ACCESSION_REGEX;
+  }
+
+  @Override
+  public boolean isValidReference(String accession)
+  {
+    return getAccessionValidator().search(accession);
+  }
+
+  @Override
+  public int getTier()
+  {
+    return 0;
+  }
+
+  /**
+   * Default test query is a transcript
+   */
+  @Override
+  public String getTestQuery()
+  {
+    // has CDS on reverse strand:
+    return "ENST00000288602";
+    // ENST00000461457 // forward strand
+  }
+
+  @Override
+  public boolean isDnaCoding()
+  {
+    return true;
+  }
+}