{'fraction_non_alphanumeric': 0.035803497085761866, 'fraction_numerical': 0.019150707743547043, 'mean_word_length': 4.488584474885845, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The RF1 gene of the killer DNA of yeast may encode a DNA polymerase.

The killer plasmid kl of the yeast Kluyveromyces lactis is a linear doublestranded DNA whose 5' ends are blocked by attached proteins like some animal viruses (1, 2). This genome contains four tightly packed genes of which three (RF2, 3 and 4) code for the killer toxin and the immunity determinant (3, 4, 5, 6). Only the function of the RF1 gene remains unknown. The aminoacid sequence of the RF1 product, deduced from its nucleotide sequence (4), has been compared with the gene products of other linear DNAs including animal viruses, a bacteriophage and a plant mitochordrial plasmid. We found, as shown in Fig.1, a significant homology with all of them at the three positions characteristic of viral DNA polymerase sequences (7, 11). Therefore, we suggest that (i) RF1 codes for a viral type DNA polymerase, (ii) the kl genome does not code for its terminal protein (which may then be encoded by the companion plasmid k2 known to be necessary for the maintenance of kl), and (iii) k2 may also code for its own DNA polymerase, since the replication of k2 is independent of kl. The sequence of k2 still remains to be established.