Final answer:
The major feature of PECAAN, in addition to gene start evidence display, is phage annotation visualization which helps in mapping and understanding phage genomes and their interactions with bacterial hosts.
Step-by-step explanation:
The other major feature of PECAAN, alongside gene start evidence display, is c) Phage annotation visualization. PECAAN (Phage Evidence Collection and Annotation Network) is a web-based tool that aids in the annotation of bacteriophage genomes. Gene start evidence display helps in determining the start of a gene, and the phage annotation visualization component allows for the mapping out and visualization of phage genomes, which is crucial in understanding the function and structure of viral proteins. Phage annotation visualization also assists scientists in comprehending the interactions between phages and their bacterial hosts, contributing to the field of genomics and proteomics.
As for the gene question related to sequencing techniques, the method used to identify regions of similarity between cell types or species is b) proteins, DNA, or RNA sequence alignment. This technique allows researchers to compare sequences to find homologous regions and draw evolutionary relationships. It's important to note that while Genomics provides the structure of protein through DNA sequence data, Proteomics studies go further to explore the function and regulation of individual proteins.