▁week ▁one , ▁scoring ▁three ▁touch down s ▁against ▁the ▁Los ▁Angeles ▁Ra iders ▁on ▁Monday ▁Night ▁Football . ▁ ▁References ▁ ▁External ▁links ▁▁ 4 9 ers ▁on ▁Pro ▁Football ▁Reference ▁ ▁Category : San ▁Francisco ▁ 4 9 ers ▁seasons ▁San ▁Francisco ▁ 4 9 ers ▁Category : N FC ▁West ▁championship ▁seasons ▁Category : National ▁Football ▁Conference ▁championship ▁seasons ▁Category : Super ▁Bowl ▁champion ▁seasons ▁San ▁Category : 1 9 9 4 ▁in ▁San ▁Francisco <0x0A> </s> ▁An ▁S - layer ▁( sur face ▁layer ) ▁is ▁a ▁part ▁of ▁the ▁cell ▁en velope ▁found ▁in ▁almost ▁all ▁arch ae a , ▁as ▁well ▁as ▁in ▁many ▁types ▁of ▁b acter ia . ▁It ▁consists ▁of ▁a ▁mon om ole cular ▁layer ▁composed ▁of ▁identical ▁prote ins ▁or ▁g ly cop rote ins . ▁This ▁structure ▁is ▁built ▁via ▁self - assembly ▁and ▁en clos es ▁the ▁whole ▁cell ▁surface . ▁Thus , ▁the ▁S - layer ▁protein ▁can ▁represent ▁up ▁to ▁ 1 5 % ▁of ▁the ▁whole ▁protein ▁content ▁of ▁a ▁cell . ▁S - layer ▁prote ins ▁are ▁poor ly ▁conser ved ▁or ▁not ▁conser ved ▁at ▁all , ▁and ▁can ▁differ ▁marked ly ▁even ▁between ▁related ▁species . ▁ ▁Depending ▁on ▁species , ▁the ▁S - layers ▁have ▁a ▁thick ness ▁between ▁ 5 ▁and ▁ 2 5   nm ▁and ▁possess ▁identical ▁por es ▁with ▁ 2 – 8   nm ▁in ▁diameter . ▁ ▁The ▁termin ology ▁“ S - layer ” ▁was ▁used