Day 59 marks the beginning of Chromosome 3. It has 19 protein-coding genes (browser view). One of the noncoding genes is a lncRNA called EGOT (eosinophil granule ontogeny transcript).
EGOT is a spliced totally-intronic noncoding RNA (it resides in the intron of the protein-coding gene ITPR1) and expressed during eosinophil development. It is one of the best-studied intronic noncoding RNAs and is conserved across amniotes, so it is probably over 300 million years old.
Click here to see the sequence of Day 59 with EGOT underlined.