A case of sickle-cell anaemia: a commentaryon ‘Abnormal human haeoglobins. I. The comparison of normal human and sickle-cell haemoglobins by ‘fingerprinting’ by V.M. Ingram Biochim. Biophys Acta 28 (1958) 539–545 with ‘II. The chymotryptic digestion of the trypsin-resistant ‘core’ of haemoglobins A and S’ by J.A. Hunt and V.M. Ingram Biochim. Biophys. Acta 28 (1958) 546–549 (Summary) and ‘III. The chemical difference between normal and sickle cell haemoglobins’ by V.M. Ingram Biochim. Biophys Acta 36 (1959) 402–411 (summary)