diff --git a/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/AnnotationByDepth.java b/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/AnnotationByDepth.java
deleted file mode 100755
index 353fd1c2c..000000000
--- a/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/AnnotationByDepth.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package org.broadinstitute.sting.gatk.walkers.annotator;
-
-import org.broadinstitute.sting.gatk.contexts.AlignmentContext;
-import org.broadinstitute.sting.gatk.walkers.annotator.interfaces.InfoFieldAnnotation;
-import org.broadinstitute.sting.utils.variantcontext.Genotype;
-
-import java.util.Map;
-
-/**
- * Abstract base class for all annotations that are normalized by depth
- */
-public abstract class AnnotationByDepth extends InfoFieldAnnotation {
-
-
-    protected int annotationByVariantDepth(final Map<String, Genotype> genotypes, Map<String, AlignmentContext> stratifiedContexts) {
-        int depth = 0;
-        for ( Map.Entry<String, Genotype> genotype : genotypes.entrySet() ) {
-
-            // we care only about variant calls
-            if ( genotype.getValue().isHomRef() )
-                continue;
-
-            AlignmentContext context = stratifiedContexts.get(genotype.getKey());
-            if ( context != null )
-                depth += context.size();
-        }
-
-        return depth;
-    }
-
-
-}
\ No newline at end of file
diff --git a/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/QualByDepth.java b/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/QualByDepth.java
index ae9a34ae2..7fcb56b1a 100755
--- a/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/QualByDepth.java
+++ b/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/QualByDepth.java
@@ -4,6 +4,7 @@ import org.broadinstitute.sting.gatk.contexts.AlignmentContext;
 import org.broadinstitute.sting.gatk.contexts.ReferenceContext;
 import org.broadinstitute.sting.gatk.refdata.RefMetaDataTracker;
 import org.broadinstitute.sting.gatk.walkers.annotator.interfaces.AnnotatorCompatibleWalker;
+import org.broadinstitute.sting.gatk.walkers.annotator.interfaces.InfoFieldAnnotation;
 import org.broadinstitute.sting.gatk.walkers.annotator.interfaces.StandardAnnotation;
 import org.broadinstitute.sting.utils.codecs.vcf.VCFHeaderLineType;
 import org.broadinstitute.sting.utils.codecs.vcf.VCFInfoHeaderLine;
@@ -20,7 +21,7 @@ import java.util.Map;
  *
  * Low scores are indicative of false positive calls and artifacts.
  */
-public class QualByDepth extends AnnotationByDepth implements StandardAnnotation {
+public class QualByDepth extends InfoFieldAnnotation implements StandardAnnotation {
 
     public Map<String, Object> annotate(RefMetaDataTracker tracker, AnnotatorCompatibleWalker walker, ReferenceContext ref, Map<String, AlignmentContext> stratifiedContexts, VariantContext vc) {
         if ( stratifiedContexts.size() == 0 )
@@ -48,8 +49,7 @@ public class QualByDepth extends AnnotationByDepth implements StandardAnnotation
         if ( depth == 0 )
             return null;
 
-        int qDepth = annotationByVariantDepth(genotypes, stratifiedContexts);
-        double QD = 10.0 * vc.getNegLog10PError() / (double)qDepth;
+        double QD = 10.0 * vc.getNegLog10PError() / (double)depth;
 
         Map<String, Object> map = new HashMap<String, Object>();
         map.put(getKeyNames().get(0), String.format("%.2f", QD));
diff --git a/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/SBByDepth.java b/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/SBByDepth.java
deleted file mode 100755
index 131b87794..000000000
--- a/public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/SBByDepth.java
+++ /dev/null
@@ -1,59 +0,0 @@
-package org.broadinstitute.sting.gatk.walkers.annotator;
-
-import org.broadinstitute.sting.gatk.contexts.AlignmentContext;
-import org.broadinstitute.sting.gatk.contexts.ReferenceContext;
-import org.broadinstitute.sting.gatk.refdata.RefMetaDataTracker;
-import org.broadinstitute.sting.gatk.walkers.annotator.interfaces.AnnotatorCompatibleWalker;
-import org.broadinstitute.sting.utils.codecs.vcf.VCFConstants;
-import org.broadinstitute.sting.utils.codecs.vcf.VCFHeaderLineType;
-import org.broadinstitute.sting.utils.codecs.vcf.VCFInfoHeaderLine;
-import org.broadinstitute.sting.utils.variantcontext.Genotype;
-import org.broadinstitute.sting.utils.variantcontext.VariantContext;
-
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-/**
- * SB annotation value by depth of alt containing samples
- */
-public class SBByDepth extends AnnotationByDepth {
-
-    public Map<String, Object> annotate(RefMetaDataTracker tracker, AnnotatorCompatibleWalker walker, ReferenceContext ref, Map<String, AlignmentContext> stratifiedContexts, VariantContext vc) {
-        if ( stratifiedContexts.size() == 0 )
-            return null;
-
-        if (!vc.hasAttribute(VCFConstants.STRAND_BIAS_KEY))
-            return null;
-
-        double sBias = vc.getAttributeAsDouble(VCFConstants.STRAND_BIAS_KEY, -1);
-
-        final Map<String, Genotype> genotypes = vc.getGenotypes();
-        if ( genotypes == null || genotypes.size() == 0 )
-            return null;
-
-        int sDepth = annotationByVariantDepth(genotypes, stratifiedContexts);
-        if ( sDepth == 0 )
-            return null;
-
-
-
-        double SbyD = (-sBias / (double)sDepth);
-        if (SbyD > 0)
-            SbyD = Math.log10(SbyD);
-        else
-            SbyD = -1000;
-        
-        Map<String, Object> map = new HashMap<String, Object>();
-        map.put(getKeyNames().get(0), String.format("%.2f", SbyD));
-        return map;
-    }
-
-    public List<String> getKeyNames() { return Arrays.asList("SBD"); }
-
-    public List<VCFInfoHeaderLine> getDescriptions() { return Arrays.asList(new VCFInfoHeaderLine(getKeyNames().get(0), 1, VCFHeaderLineType.Float, "Strand Bias by Depth")); }
-
-
-
-}
\ No newline at end of file