diff --git a/python/obitools3/format/fasta.pxd b/python/obitools3/format/fasta.pxd
index f2bbe5b..985c500 100644
--- a/python/obitools3/format/fasta.pxd
+++ b/python/obitools3/format/fasta.pxd
@@ -4,7 +4,7 @@ from cython.view cimport array as cvarray
 
 cdef class FastaFormat:
 
-    cdef HeaderFormat headerFormater
+    cdef HeaderFormat headerFormatter
     
     cdef size_t  sequenceBufferLength
     cdef char*   sequenceBuffer
diff --git a/python/obitools3/format/fasta.pyx b/python/obitools3/format/fasta.pyx
index 67005f7..b09e36a 100644
--- a/python/obitools3/format/fasta.pyx
+++ b/python/obitools3/format/fasta.pyx
@@ -1,17 +1,22 @@
+#cython: language_level=3
+
 cimport cython
+from obitools3.dms.capi.obiview cimport NUC_SEQUENCE_COLUMN
+from obitools3.utils cimport bytes2str
+
 
 cdef class FastaFormat:
 	
 	def __init__(self, list tags=[], bint printNAKeys=False):
-		self.headerFormater = HeaderFormat(True,
-										   tags,
-										   printNAKeys)
+		self.headerFormatter = HeaderFormat("fasta",
+										    tags,
+										    printNAKeys)
 		
 	@cython.boundscheck(False)	
-	def __call__(self, dict data):
-		cdef bytes brawseq      = data['sequence']
+	def __call__(self, object data):
+		cdef bytes brawseq      = data[NUC_SEQUENCE_COLUMN]
 		cdef size_t lseq        = len(brawseq)
-		cdef size_t k=0
+		cdef size_t k           = 0
 		cdef list   lines       = []
 		
 		for k in range(0,lseq,60):
@@ -19,12 +24,5 @@ cdef class FastaFormat:
 			
 		brawseq = b'\n'.join(lines)
 		
-		return "%s\n%s" % (self.headerFormater(data),bytes2str(brawseq))
+		return bytes2str(self.headerFormatter(data) + b"\n" + brawseq)
 					
-		
-				
-			
-		
-		
-		
-		
\ No newline at end of file