diff --git a/deep_sequencing_unit/source/java/ch/ethz/bsse/cisd/dsu/tracking/main/TrackingBO.java b/deep_sequencing_unit/source/java/ch/ethz/bsse/cisd/dsu/tracking/main/TrackingBO.java
index 2ceee04c790f26bddeb88f0ba238973b0962d724..27fe2a246ec7b554ae436f5220f1cd54705cf68b 100644
--- a/deep_sequencing_unit/source/java/ch/ethz/bsse/cisd/dsu/tracking/main/TrackingBO.java
+++ b/deep_sequencing_unit/source/java/ch/ethz/bsse/cisd/dsu/tracking/main/TrackingBO.java
@@ -28,8 +28,6 @@ import java.util.Map.Entry;
 import java.util.Set;
 import java.util.TreeMap;
 import java.util.TreeSet;
-import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
 import ch.ethz.bsse.cisd.dsu.tracking.dto.TrackedEntities;
 import ch.ethz.bsse.cisd.dsu.tracking.dto.TrackingStateDTO;