I would like to do a "transactional publication with updatable subscriptions".  SQL Server gave me this warning: 

All articles in a publication allowing updatable subscriptions contain a uniqueidentifier column named 'MSrepl_tran_version' used for tracking changes to the replicated data. SQL Server adds such a column to published tables that do not have one. 
Adding a new column will:
     » Cause INSERT statements without column lists to fail.
     » Increase the size of the table. 
SQL Server will add a uniqueidentifier column to each of the following tables when the publication is created.
    [dbo].[cmsContent]
 [dbo].[cmsContentType]
 [dbo].[cmsContentType2ContentType]
 [dbo].[cmsContentTypeAllowedContentType]
   [dbo].[cmsContentVersion]
  [dbo].[cmsContentXml]
  [dbo].[cmsDataType]
    [dbo].[cmsDataTypePreValues]
   [dbo].[cmsDictionary]
  [dbo].[cmsDocument]
    [dbo].[cmsDocumentType]
    [dbo].[cmsLanguageText]
    [dbo].[cmsMacro]
   [dbo].[cmsMacroProperty]
   [dbo].[cmsMacroPropertyType]
   [dbo].[cmsMember]
  [dbo].[cmsMember2MemberGroup]
  [dbo].[cmsMemberType]
  [dbo].[cmsPreviewXml]
  [dbo].[cmsPropertyData]
    [dbo].[cmsPropertyType]
    [dbo].[cmsPropertyTypeGroup]
   [dbo].[cmsStylesheet]
  [dbo].[cmsStylesheetProperty]
  [dbo].[cmsTagRelationship]
 [dbo].[cmsTags]
    [dbo].[cmsTask]
    [dbo].[cmsTaskType]
    [dbo].[cmsTemplate]
    [dbo].[ELMAH_Error]
    [dbo].[umbracoDomains]
 [dbo].[umbracoLanguage]
    [dbo].[umbracoLog]
 [dbo].[umbracoNode]
    [dbo].[umbracoRelation]
    [dbo].[umbracoRelationType]
    [dbo].[umbracoServer]
  [dbo].[umbracoUser]
    [dbo].[umbracoUser2app]
    [dbo].[umbracoUser2NodeNotify]
 [dbo].[umbracoUser2NodePermission]
 [dbo].[umbracoUserType]