1.A.153. The Putative Chemoreceptor (PCR) Family  These protein are found in animals (Tardigrade, i.e., (Water bears), and are diverse in sequence, but they have the usual 2 or 3 + 2 + 2 + 1 TMS topology.  They are presumed to resemble Odorant Receptors of TC family # 1.A.69 (Himmel et al. 2023). After two iterations with PSI-BLAST, members of family 1.A.69 come up in large numbers.