3506533 SYN1 synapsin 1 71 3506531 Syn-1 syndecan-1 21 3506545 Syn1 Syncytin1 2 3506544 Syn1 synapsin-1 promoter 1 3506546 Syn1 Synbiotic1 group 1 3506547 Syn1 Syntrophin-1 1