anchor.diff:  
     # The item at the end of the edge
     node: Gene
  +}
  +
  +# A user-facing thematic grouping of Genes
  +type GeneFamily {
  +  featuredGeneLinks: [FeaturedGeneLink]
  +  genes: [Gene]
  +
  +  # A globally unique ID.
  +  id: ID!
  +
  +  # A type-specific ID likely used as a database ID.
  +  internalID: ID!
  +  name: String!
  +
  +  # A slug ID.
  +  slug: ID!
  +}
  +
  +# A connection to a list of items.
  +type GeneFamilyConnection {
  +  # A list of edges.
  +  edges: [GeneFamilyEdge]
  +
  +  # Information to aid in pagination.
  +  pageInfo: PageInfo!
  +}
  +
  +# An edge in a connection.
  +type GeneFamilyEdge {
  +  # A cursor for use in pagination
  +  cursor: String!
  +
  +  # The item at the end of the edge
  +  node: GeneFamily
   }
   
   type GravityMutationError {
  
positive.code:     id: String!
    ): Gene
  
    # A list of Genes
    genes(
      size: Int
  
negative.code:     id: String!
    ): Gene
  
    # A list of Gene Families
    geneFamiliesConnection(after: String, before: String, first: Int, last: Int): GeneFamilyConnection
  
    # A list of Genes
    genes(
      size: Int
  