Hi, I am analyzing some publicly available datasets that have used Sequin RNA standards (https://www.sequinstandards.com/rna/) as spike ins. However, I am not able to locate further information about sequins, namely a fasta file for sequin sequences, a gtf file for their annotation as well as their relative abundance (amount) in the mixture. The website link in the original paper (https://www.nature.com/articles/nmeth.3958) does not seem to work.
Can someone provide me with this information or direct me to an appropriate link? Thanks