1970s Topps on the back was in a different typeface. The Burger King set featured 22 cards plus a checklist card. Several cards reflected players changing teams, most notably Pete Rose (Phillies) and Tommy John (Yankees). During the 1970s Topps issued cards featuring the two professional basketball leagues active at the time, the American Basketball Association (ABA) and the National Basketball Association (NBA) until they merged in 1976. Base set 264 cards (NBA/ABA) Size: 2.5 × 3.5 inches Base set 264 cards (NBA/ABA) Size: 2.5 × 3.5 inches Base set 144 cards (NBA) Size: 3⅛ × 5¼ inches. Base set 132 cards
Molecular-weight size marker account when selecting a protein marker. RNA ladders composed of RNA molecular-weight size markers were initially developed by using the synthetic circle method to produce different-sized markers. This technique was improved upon by inventor Eric T. Kool to use circular DNA vectors as a method for producing RNA molecular-weight size markers. As referred to as the rolling circle method, the improvements of this technique stems from its efficiency in synthesizing RNA oligonucleotides. From the circular DNA template, single-stranded RNA varying in length from 4-1500 bp can be produced without the need for primers and by recycling nucleotide triphosphate. DNA can