text: import { GraphQLInt, GraphQLNonNull, GraphQLObjectType, GraphQLString } from 'graphql'
  
  export const ExonType = new GraphQLObjectType({
    name: 'Exon',
    fields: {
      feature_type: { type: new GraphQLNonNull(GraphQLString) },
      start: { type: new GraphQLNonNull(GraphQLInt) },
      stop: { type: new GraphQLNonNull(GraphQLInt) },
    },
  })
  