Aetna CEO: Obamacare In A 'Death Spiral' Heading Into 2018. Aetna and Humana have called off their deal amid government concerns over competition. Here's a look back at six pivotal moments that led to this. Aetna and Humana have called off their deal amid government concerns over competition.
For the plant genus, see Synapsis (plant). Synapsis (also called syndesis) is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis.
While autosomes undergo synapsis during meiosis, sex chromosomes often remain unpairedSource Wikipedia Note that a few times the word synapsis is used as an equivalent of the word synapse, which is  The junction, or structure at the junction, between two neurons or nerve-cells. The two words have the same origin and are an adaptation of the Greek ÏÏÎ½Î±ÏÎ¹Ï (from the OED).