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 Molecular-weight size marker A molecular-weight size marker, also referred to as a protein ladder, DNA ladder, or RNA ladder, is a set of standards that are used to identify the approximate size of a molecule run on a gel during electrophoresis, using the principle that molecular weight is inversely proportional to migration rate through a gel matrix. Therefore, when used in gel electrophoresis, markers effectively provide a logarithmic scale by which to estimate the size of the other fragments (providing the fragment sizes of the marker are known). Protein, DNA, and RNA markers with pre-determined fragment sizes and concentrations are