public BitCodec<InsertionVariation> buildCodec(CramHeader header,
CompressionHeader compression,
SequenceBaseProvider referenceBaseProvider,
DefaultMutableTreeNode parent) throws CramCompressionException {
InsertionVariationCodec codec = new InsertionVariationCodec();
DefaultMutableTreeNode node = buildNode(codec, "Insertion codec");
parent.add(node);
codec.insertBasesCodec = register(
bitCodecFactory.buildByteArrayCodec(compression