Later re-examinations of the remains confirmed Smith's original identification of the mummy as belonging to a young male (although with feminine trends) but pushed the estimated age of death back to around 20 years. These re-examinations also indicated that the body showed no signs of delayed maturation, and that, while the skull was of unusual shape, it certainly wasn't abnormal, and showed no indication of hydrocephalus. Reconstruction of the facial features of the skull also indicated that there was no resemblance with Akhenaten's representation on his monuments. It must be remembered though, that Akhenaten's representations are highly stylised. After the discovery of the tomb of Tutankhamun a close resemblance was noted between his mummy and the body found in KV55 and later tests showed both shared the same blood-group (A2) and serum antigen (MN), all of which suggests Tutankhamun and the individual found in KV55 were closely related to each other, either as father and son, or brothers. Based on these results it was concluded that the KV55 body was too young to be Akhenaten and they were seen to support the claim that the mummy was that of Smenkhkare, an idea first proposed by Rex Engelbach in 1931.