def format_element(eseq):
	"""Format a sequence element using FASTA format (split in lines of 80 chr).

	Args:
		eseq (string): element sequence.

	Return:
		string: lines of 80 chr
	"""
	k = 80
	eseq = [eseq[i:min(i + k, len(eseq))]for i in range(0, len(eseq), k)]
	return("\n".join(eseq))