In sickle cell anaemia, there is a change in the amino acid in the beta chain at position:

Q. In sickle cell anaemia, there is a change in the amino acid at _____ position of the haemoglobin chain.

Q. In sickle cell anaemia, the sequence of amino acids from first to seventh position of $\beta$-chain of haemoglobin S (HbS) is _______________.

Q. Amino acid substituted in sickle cell anaemia is