specimens = try! Realm().objects(Specimen) // 2

// Create annotations for each one
for specimen in specimens { // 3
  let coord = CLLocationCoordinate2D(latitude: specimen.latitude, longitude: specimen.longitude);
  let specimenAnnotation = SpecimenAnnotation(coordinate: coord,
    title: specimen.name,
    subtitle: specimen.category.name,
    specimen: specimen)
  mapView.addAnnotation(specimenAnnotation) // 4
}