diff --git a/genomkit/regions/gregion.py b/genomkit/regions/gregion.py
index 4afd75a..e01862b 100644
--- a/genomkit/regions/gregion.py
+++ b/genomkit/regions/gregion.py
@@ -236,7 +236,7 @@ def resize(self, extend_upstream: int, extend_downstream: int,
         :rtype: GRegion
         """
         if center == "mid_point":
-            center = int(0.5*(self.end-self.start))
+            center = self.start + int(0.5*(self.end-self.start))
             if self.orientation == "-":
                 start = center-extend_downstream
                 end = center+extend_upstream
@@ -261,6 +261,10 @@ def resize(self, extend_upstream: int, extend_downstream: int,
                 center = self.end
                 start = center-extend_upstream
                 end = center+extend_downstream
+        if start < 0:
+            start = 0
+        if end < 0:
+            end = 0
         res = GRegion(sequence=self.sequence, start=start, end=end,
                       orientation=self.orientation, score=self.score,
                       name=self.name, data=self.data)
diff --git a/genomkit/regions/gregions.py b/genomkit/regions/gregions.py
index 3021df0..5550186 100644
--- a/genomkit/regions/gregions.py
+++ b/genomkit/regions/gregions.py
@@ -958,12 +958,12 @@ def get_GSequences(self, FASTA_file):
             print(FASTA_file + " is not found.")
             sys.exit()
         res = GSequences(name=self.name)
-        for region in self.elements:
+        for region in tqdm(self.elements, desc="Get GSequences"):
             seq = fasta.get_sequence(name=region.sequence,
                                      start=region.start,
                                      end=region.end)
             if seq:
-                seq.name = region.name
+                seq.name = str(region)
                 seq.data = region.data
                 if region.orientation == "-":
                     seq.reverse_complement()
diff --git a/genomkit/sequences/gsequences.py b/genomkit/sequences/gsequences.py
index 267a020..3faefe0 100644
--- a/genomkit/sequences/gsequences.py
+++ b/genomkit/sequences/gsequences.py
@@ -130,7 +130,7 @@ def get_sequence(self, name, start, end):
                 return seq.slice_sequence(start, end)
 
     def write_FASTA(self, filename: str, data: bool = False,
-                    gz: bool = True):
+                    gz: bool = False):
         write_FASTA(seqs=self, filename=filename, data=data, gz=gz)
 
     def write_FASTQ(self, filename: str, data: bool = False,
diff --git a/genomkit/sequences/io.py b/genomkit/sequences/io.py
index f2a2f3f..ffa1534 100644
--- a/genomkit/sequences/io.py
+++ b/genomkit/sequences/io.py
@@ -30,7 +30,7 @@ def load_FASTA_from_file(file):
                 # If there was a previously stored sequence, store it
                 if current_sequence_id is not None:
                     infos = re.split(r'[ |;,-]', current_sequence_id)
-                    name = infos[0]
+                    name = infos[0].split(".")[0]
                     data = infos[1:]
                     res.add(GSequence(sequence=current_sequence,
                                       name=name, data=data))
@@ -45,7 +45,7 @@ def load_FASTA_from_file(file):
         # Store the last sequence
         if current_sequence_id is not None:
             infos = re.split(r'[ |;,-]', current_sequence_id)
-            name = infos[0]
+            name = infos[0].split(".")[0]
             data = infos[1:]
             res.add(GSequence(sequence=current_sequence,
                               name=name, data=data))
@@ -106,7 +106,7 @@ def load_FASTQ_from_file(file):
 
 
 def write_FASTA(seqs, filename: str, data: bool = False,
-                gz: bool = True):
+                gz: bool = False):
     if gz:
         with gzip.open(filename, "wt") as fasta_file:
             write_fasta_content(seqs, fasta_file, data)