diff --git a/python/obitools3/dms/obiseq.pyx b/python/obitools3/dms/obiseq.pyx
index c7bbbec..efa1b30 100644
--- a/python/obitools3/dms/obiseq.pyx
+++ b/python/obitools3/dms/obiseq.pyx
@@ -16,6 +16,10 @@ from .capi.obiview cimport NUC_SEQUENCE_COLUMN, \
 
 from .capi.obiutils cimport reverse_complement_sequence
 
+from obitools3.format.fasta import FastaFormat
+from obitools3.format.fastq import FastqFormat
+
+
 from cpython cimport array
 import array
 from copy import deepcopy
@@ -414,3 +418,10 @@ cdef class Nuc_Seq_Stored(Seq_Stored) :
     def __len__(self):
         return len(self._view.get_column(NUC_SEQUENCE_COLUMN).get_line(self.index))
 
+    def __repr__(self):
+        if self.quality is None:
+            formatter = FastaFormat()
+        else:
+            formatter = FastqFormat()
+        return bytes2str(formatter(self))
+