text: from django import template
  from django.conf import settings
  
  register = template.Library()
  
  @register.simple_tag
  def get_hostnames():
      if settings.DEBUG:
          return {
              'gpcr': "",
              'gprotein': "",
              'arrestin': "",
          }
      else:
          return {
              'gpcr': "https://gpcrdb.org",
              'gprotein': "https://gproteindb.org",
              'arrestin': "https://arrestindb.org",
          }
  