diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index 762836d..390efe2 100644
--- a/pkg/obioptions/version.go
+++ b/pkg/obioptions/version.go
@@ -8,7 +8,7 @@ import (
 // corresponds to the last commit, and not the one when the file will be
 // commited
 
-var _Commit = "add9d89"
+var _Commit = "27fa984"
 var _Version = "Release 4.4.0"
 
 // Version returns the version of the obitools package.
diff --git a/pkg/obitools/obisummary/obisummary.go b/pkg/obitools/obisummary/obisummary.go
index 6e47afa..605bee5 100644
--- a/pkg/obitools/obisummary/obisummary.go
+++ b/pkg/obitools/obisummary/obisummary.go
@@ -139,7 +139,10 @@ func (data *DataSummary) Update(s *obiseq.BioSequence) *DataSummary {
 	}
 
 	for k, v := range s.Annotations() {
+		_, isSov := v.(*obiseq.StatsOnValues)
 		switch {
+		case isSov:
+			plusOneUpdateIntMap(data.map_tags, k)
 		case obiutils.IsAMap(v):
 			plusOneUpdateIntMap(data.map_tags, k)
 		case obiutils.IsASlice(v):
diff --git a/pkg/obiutils/cast_interface.go b/pkg/obiutils/cast_interface.go
index 7184f45..0218ffd 100644
--- a/pkg/obiutils/cast_interface.go
+++ b/pkg/obiutils/cast_interface.go
@@ -2,6 +2,7 @@ package obiutils
 
 import (
 	"fmt"
+	"maps"
 	"reflect"
 	"strconv"
 	"strings"
@@ -90,7 +91,21 @@ func InterfaceToBool(i interface{}) (val bool, err error) {
 // It returns a map[string]interface{} which is the converted map. If the input map is not of type map[string]interface{},
 // it panics and logs an error message.
 func MapToMapInterface(m interface{}) map[string]interface{} {
-	if IsAMap(m) {
+	type hasMap interface {
+		Map() map[string]int
+		RLock()
+		RUnlock()
+		Len() int
+	}
+
+	if v, ok := m.(hasMap); ok {
+		val := make(map[string]interface{}, v.Len())
+		v.RLock()
+		defer v.RUnlock()
+		for k, v := range v.Map() {
+			val[k] = v
+		}
+	} else if IsAMap(m) {
 		reflectMap := reflect.ValueOf(m)
 		keys := reflectMap.MapKeys()
 		val := make(map[string]interface{}, len(keys))
@@ -193,9 +208,19 @@ func InterfaceToFloat64(i interface{}) (val float64, err error) {
 func InterfaceToIntMap(i interface{}) (val map[string]int, err error) {
 	err = nil
 
+	type hasMap interface {
+		Map() map[string]int
+		RLock()
+		RUnlock()
+	}
+
 	switch i := i.(type) {
 	case map[string]int:
 		val = i
+	case hasMap:
+		i.RLock()
+		defer i.RUnlock()
+		val = maps.Clone(i.Map())
 	case map[string]interface{}:
 		val = make(map[string]int, len(i))
 		for k, v := range i {
@@ -219,9 +244,23 @@ func InterfaceToIntMap(i interface{}) (val map[string]int, err error) {
 func InterfaceToStringMap(i interface{}) (val map[string]string, err error) {
 	err = nil
 
+	type hasMap interface {
+		Map() map[string]int
+		RLock()
+		RUnlock()
+		Len() int
+	}
+
 	switch i := i.(type) {
 	case map[string]string:
 		val = i
+	case hasMap:
+		val = make(map[string]string, i.Len())
+		i.RLock()
+		defer i.RUnlock()
+		for k, v := range i.Map() {
+			val[k] = strconv.Itoa(v)
+		}
 	case map[string]interface{}:
 		val = make(map[string]string, len(i))
 		for k, v := range i {