An isolated polynucleotide is provided. The isolated polynucleotide comprising a nucleic acid sequence encoding a polypeptide of a Type II reaction center of a photosynthetic organism, the nucleic acid sequence being capable of imparting the type II reaction center with an activity under a temperature range different than that of the type II reaction center endogenous to the photosynthetic organism. Also provided are methods of using the sequences for generating photosynthetic organisms or tailor-made thermotolerance.

There is provided a nucleic acid molecule comprising a nucleotide sequence encoding a factor VIII protein, wherein a B domain portion of the factor VIII protein is encoded by a nucleotides sequence between 90 and 111 nucleotides in length and has an amino acid sequence that is at least 85% identical to SEQ ID NO: 4 which comprises six asparagine residues. Also provided is a factor VIII protein, a vector comprising the above nucleic acid molecule, a host cell, a transgenic animal, a method of treating Haemophilia A, and a method for the preparation of a parvoviral gene delivery vector.

The invention provides methods and compositions for modifying tocochromanol biosynthesis in plants. The present invention thus surprisingly and beneficially provides for increasing desired tocochromanol compounds in plants and enhancing the nutritional quality of human food and animal feed, without associate deleterious plant phenotypes.